Apple Cinnamon Baked Oatmeal

Some mornings call for a breakfast that feels like a warm hug, and this apple cinnamon baked oatmeal delivers exactly that.

It is soft in the middle, golden on top, and packed with juicy apple pieces in every bite.

I bake a pan on Sunday and reheat squares all week long. Honestly, it has saved my weekday mornings more times than I can count.

The texture lands somewhere between a bowl of creamy oatmeal and a slice of apple cake. Warm cinnamon and a little maple syrup do all of the flavor work.

If you have ever wished oatmeal could taste like dessert while still counting as breakfast, grab a big spoon.

It also pairs really well with my peach baked oatmeal if you like rotating flavors through the week.

Quick Recipe Summary
Prep Time	15 minutes
Cook Time	40 minutes
Total Time	55 minutes
Servings	9 squares
Difficulty Level	Easy

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Why You’ll Love This Apple Cinnamon Baked Oatmeal

This baked oatmeal earns a permanent spot in my breakfast rotation for a lot of good reasons.

Here is what makes it so easy to love.

• Make-ahead friendly: Bake one pan and enjoy ready-to-heat breakfasts for several days, which makes busy mornings so much calmer.
• One bowl, minimal cleanup: You only need two mixing bowls and a baking dish, so there is barely anything to wash.
• Cozy, familiar flavors: Cinnamon, vanilla, maple syrup, and tender apples taste like a fall bakery without any of the fuss.
• Lightly sweetened: Applesauce, maple syrup, and the apples themselves provide the sweetness, so there is no refined sugar in the batter.
• Budget friendly: Oats, eggs, milk, and apples are inexpensive, and you probably have most of them at home already.
• Easy to customize: Swap the nuts, change the fruit, or add a spoonful of protein powder to fit your own routine.
• Family approved: Even people who claim they dislike oatmeal tend to go back for a second square.

The same cozy apple flavor shows up in my Apple Pie Overnight Oats Recipe, if you want a no-bake version.

Ingredients

Everything in this recipe is simple and easy to find at any grocery store. Here is exactly what you need for an 8×8-inch pan.

• 3 cups old-fashioned rolled oats
• 1 teaspoon baking powder
• 2 teaspoons ground cinnamon, divided
• 1/2 teaspoon fine salt
• 2 cups milk (whole milk gives the creamiest result)
• 1/2 cup unsweetened applesauce
• 1/3 cup pure maple syrup
• 2 large eggs
• 3 tablespoons unsalted butter, melted and slightly cooled
• 2 teaspoons pure vanilla extract
• 2 medium apples, such as Honeycrisp or Granny Smith, cored and diced (about 2 cups)
• 1/2 cup chopped walnuts, divided (optional)

I like to use my own homemade applesauce here when I have a batch in the fridge.

Kitchen Equipment Needed

You do not need anything fancy for this recipe. A few basic tools and one good baking dish are all it takes.

• 8×8-inch glass baking dish
• Large mixing bowl
• Medium mixing bowl
• Whisk
• Rubber spatula
• Measuring cups and spoons
• Cutting board and sharp knife
• Apple corer and slicer (optional, but it speeds up prep)
• Cooking spray or a little butter for greasing
• Glass meal prep containers for storing squares

Read Also: Apple Crumble Muffins Recipe

Recommended Products for This Recipe

These are my personal recommendations based on how often I make baked oatmeal in my own kitchen.

None of them are required, but each one makes the recipe a little easier or tastier.

1. Glass 8×8 Baking Dish

A glass dish heats evenly, so the edges set nicely without drying out before the center is done.

You can also see the golden color of the bottom and sides, which helps you know when it is ready. It goes straight from the fridge to the microwave for reheating, too.

Get it on Amazon

2. Pure Maple Syrup, Grade A Dark

Real maple syrup has a deeper flavor than pancake syrup, and it really shines in a recipe this simple.

The dark, robust variety stands up beautifully to the cinnamon and apples. A little goes a long way, so one bottle lasts for many batches.

Get it on Amazon

3. Ground Saigon Cinnamon

Saigon cinnamon is bolder and sweeter than the standard grocery store kind.

Since cinnamon is the star of this dish, using a high-quality one gives you a warmer, more bakery-style aroma. I notice the difference every time I open the jar.

Get it on Amazon

4. Apple Corer, Slicer, and Peeler

Dicing apples by hand is not hard, but a good corer makes the job faster and safer.

It gives you even pieces, and even pieces bake at the same rate. If you make baked oatmeal often, this small gadget pays for itself.

Get it on Amazon

5. Glass Meal Prep Containers With Lids

Baked oatmeal is at its best as a make-ahead breakfast, and airtight glass containers keep the squares fresh all week.

They do not hold onto smells or stains, and you can reheat right in the container.

Stack them in the fridge and breakfast is basically done.

Get it on Amazon

My homemade apple pie spice blend is another easy way to add extra warmth to this oatmeal.

Step-by-Step Instructions: How to Make Apple Cinnamon Baked Oatmeal

1. Preheat the Oven and Prepare the Baking Dish

• Position an oven rack in the center of the oven, then preheat to 350°F (175°C).
• Grease an 8×8-inch baking dish with cooking spray or a thin layer of butter, making sure to coat the corners.
• Set the dish on the counter near your mixing bowls so it is ready when the batter is done.

2. Prep the Apples

• Wash the apples well. Peeling is optional, and I usually leave the skin on for extra fiber and color.
• Cut each apple into quarters and remove the cores.
• Dice the apples into small pieces, about 1/2 inch each, so they soften evenly while baking.
• Set aside a few thin slices if you want to decorate the top later.

3. Mix the Dry Ingredients

• In a large mixing bowl, add the 3 cups of rolled oats.
• Add the baking powder, 1 3/4 teaspoons of the cinnamon, and the salt.
• Add half of the chopped walnuts if you are using them, and save the rest for the topping.
• Stir everything together with a spatula until the cinnamon is evenly distributed.

4. Whisk the Wet Ingredients

• In a medium bowl, add the milk, unsweetened applesauce, and maple syrup.
• Crack in the 2 eggs and add the vanilla extract.
• Pour in the melted butter. Let it cool slightly first so it does not scramble the eggs.
• Whisk for about 30 seconds until the mixture is smooth and the eggs are fully broken up.

5. Combine and Fold in the Apples

• Pour the wet mixture into the bowl with the dry ingredients.
• Stir gently until all of the oats are moistened.
• Fold in the diced apples so they are spread throughout the batter.
• Let the mixture sit for 5 minutes so the oats can start absorbing the liquid.

6. Fill the Dish and Add the Topping

• Give the batter one more stir, then pour it into the prepared baking dish.
• Use the spatula to spread it into an even layer, pressing the oats and apples down gently so they are mostly submerged in liquid.
• Arrange the reserved apple slices on top, if using.
• Sprinkle the remaining walnuts and the last 1/4 teaspoon of cinnamon over the surface.

7. Bake Until Set and Golden

• Place the dish on the center rack and bake for 35 to 40 minutes.
• Check at 35 minutes. The top should be golden brown and the center should look set, not wet.
• Gently touch the middle. It should spring back slightly and feel firm.
• If the center still looks loose, bake for 5 more minutes and check again.

8. Cool and Serve

• Remove the dish from the oven and place it on a wire rack.
• Let it rest for 10 minutes so the oatmeal firms up and slices cleanly.
• Cut into 9 squares and serve warm with a splash of milk, a drizzle of maple syrup, or any toppings you like.

Another favorite: Apple Cinnamon French Toast Casserole

Tips for The Best Apple Cinnamon Baked Oatmeal

A few small details make the difference between good baked oatmeal and great baked oatmeal.

These are the things I have learned after many, many pans.

• Use old-fashioned rolled oats: They hold their shape and give the best chewy, cake-like texture. Quick oats can turn mushy.
• Choose firm apples: Honeycrisp, Granny Smith, and Braeburn keep some structure while baking instead of turning into mush.
• Dice the apples small: Smaller pieces cook through completely and distribute better in every square.
• Let the batter rest: Those 5 minutes give the oats time to soak up liquid, which helps the finished dish set properly.
• Check your oven temperature: An oven thermometer helps you avoid dry edges and an underbaked center.
• Do not skip the resting time: Cutting into the pan right out of the oven gives you loose, crumbly squares.
• Toast the walnuts first: Two minutes in a dry skillet brings out a deeper, nuttier flavor.

For more everyday oatmeal know-how, my guide on how to make the perfect oatmeal covers the basics on the stovetop.

Serving Suggestions

This baked oatmeal is wonderful on its own, but a few toppings turn it into a real treat.

Here are my favorite ways to serve it.

• Warm with a splash of cold milk poured over the top
• With a dollop of plain or vanilla Greek yogurt and a drizzle of maple syrup
• Topped with sliced bananas and a spoonful of peanut butter
• With a small scoop of vanilla ice cream for a dessert-style treat
• Alongside a hot cup of coffee or chai for a slow weekend breakfast
• Cut into small squares as a portable snack for school or work

For a protein-packed pairing, try: Greek Yogurt With Granola

Variations of Apple Cinnamon Baked Oatmeal

Once you have the base recipe down, it is easy to switch things up.

These are some of my favorite twists.

• Nut swap: Use pecans or almonds instead of walnuts, or leave the nuts out completely for a nut-free version.
• Raisin or cranberry boost: Stir in 1/3 cup of raisins or dried cranberries for a chewy, tart bite.
• Extra protein: Whisk a scoop of vanilla protein powder into the dry ingredients and add a splash more milk if the batter looks thick.
• Dairy-free: Use almond, oat, or coconut milk and swap the butter for coconut oil.
• Brown sugar crunch: Sprinkle 1 tablespoon of brown sugar over the top before baking for a slightly caramelized crust.
• Apple pie spice: Replace the cinnamon with the same amount of apple pie spice for a more layered flavor.
• Baked oatmeal cups: Divide the batter into a greased muffin tin and bake for about 22 to 25 minutes.

If you enjoy maple and nuts together, you might also like: Maple Pecan Overnight Oats Recipe

Storage and Reheating

Baked oatmeal is one of the best recipes for meal prep because it keeps and reheats so well.

Here is how to store it.

• Cool completely: Let the oatmeal cool to room temperature before storing so condensation does not make it soggy.
• Refrigerator: Store squares in an airtight container for up to 5 days.
• Freezer: Wrap individual squares in parchment paper, place them in a freezer bag, and freeze for up to 3 months.
• Microwave reheating: Heat a square for 45 to 60 seconds with a splash of milk on top to keep it moist.
• Oven reheating: Cover with foil and warm at 350°F for about 10 minutes.
• From frozen: Thaw overnight in the fridge, or microwave for 90 seconds, stirring gently halfway through if needed.

Read Also: Brown Sugar Cinnamon Overnight Oats

Nutritional Facts

These values are approximate and based on 9 servings made with whole milk and walnuts.

They will vary depending on the brands and substitutions you use.

• Calories: about 270 per square
• Carbohydrates: about 34 g
• Protein: about 7 g
• Fat: about 12 g
• Saturated fat: about 4 g
• Fiber: about 4 g
• Sugar: about 14 g
• Sodium: about 190 mg

If you like a higher-protein option, my banana oatmeal protein cookies are another good grab-and-go choice.

Health Benefits of Key Ingredients

This recipe is made with simple, wholesome ingredients that add real nutritional value to your morning.

Here is a closer look at what each one brings.

• Rolled oats: A good source of fiber, including beta-glucan, which is linked to heart health and helps keep you full.
• Apples: Provide fiber, natural sweetness, and vitamin C, especially when you leave the skin on.
• Cinnamon: Adds big flavor without extra sugar or calories.
• Eggs: Contribute high-quality protein that helps the oatmeal set and keeps you satisfied.
• Walnuts: Supply healthy fats, including plant-based omega-3s, plus a bit of extra protein.
• Milk: Adds calcium and protein, and gives the oatmeal its creamy texture.
• Optional flaxseed: A tablespoon of ground flaxseed stirred into the dry ingredients adds even more fiber and omega-3s.

For another wholesome make-ahead breakfast, try: Banana Protein Overnight Oats

FAQs About Apple Cinnamon Baked Oatmeal

1. Can I use quick oats or instant oats?

Old-fashioned rolled oats give the best texture and are my strong recommendation.

Quick oats absorb liquid faster and can turn the finished dish mushy.

If quick oats are all you have, reduce the milk to about 1 3/4 cups and check the oatmeal a few minutes early.

2. Can I prepare this baked oatmeal the night before?

Yes, you can mix the batter, cover the dish, and refrigerate it overnight.

Add 5 to 10 minutes to the baking time since the dish will go into the oven cold.

Many people enjoy the extra-soft texture you get from an overnight soak. It is a lovely option for holiday mornings.

3. What are the best apples for baked oatmeal?

Firm apples like Honeycrisp, Granny Smith, Braeburn, and Pink Lady work best.

They stay tender but keep a little bite after baking.

Softer varieties like McIntosh tend to break down more, which can be nice if you want the apples to melt into the oatmeal.

4. Why is my baked oatmeal dry or mushy?

Dry baked oatmeal usually means it was overbaked or the oats were not fully moistened.

Make sure all of the oats are coated in liquid and pull the pan as soon as the center is set.

Mushy oatmeal is most often caused by quick oats or too much liquid. Measure carefully and stick with rolled oats for the best results.

5. Can I make this baked oatmeal vegan or gluten-free?

For gluten-free, use certified gluten-free rolled oats, since regular oats can be cross-contaminated during processing.

Everything else in the recipe is naturally gluten-free.

For a vegan version, use plant-based milk, coconut oil, and a flax egg for each egg.

Let the flax mixture sit for 5 minutes before adding it to the wet ingredients.

For a full lineup of make-ahead ideas, browse my easy breakfast recipes.

Conclusion

This apple cinnamon baked oatmeal is the kind of recipe I come back to again and again.

It is comforting, simple, and makes the whole house smell amazing.

Bake a pan this weekend and see how much smoother your mornings feel.

If you try it, leave a comment below and let me know how it turned out, or share a photo with your favorite toppings.

Recommended:

• Apple Cinnamon Scones Recipe
• Apple Cinnamon Blondies Recipe
• Cinnamon Apple Cake Recipe
• Caramel Apple Crisp Recipe
• Apple Cinnamon Detox Drink