Baked Oatmeal · Apple Cinnamon
Apple Cinnamon Baked Oatmeal
Diced apples, cinnamon and a little brown sugar baked into soft, sliceable oatmeal that makes the kitchen smell like apple pie. A cozy fall breakfast that keeps all week.
- Prep
- 15 min
- Cook
- 40 min
- Total
- 1 hr 5 min
- Serves
- one 8x8 pan
- Level
- Easy
Ingredients
- butter, or cooking spray, for the pan
Swaps for butter
Instead of butter
- Plant-based butter sticks: The same amount. The closest swap.
- Refined coconut oil: The same amount: solid when the butter is soft or cold, melted when it is melted. It is all fat, so bakes are a bit more tender and rich, with no butter flavor.
- Vegetable oil: 3 tbsp oil for every 4 tbsp (¼ cup) melted butter. Cakes and muffins come out moister and stay soft longer, without a buttery taste.
Cooking for an allergy? Check every label.
- 3 cups rolled oats, old-fashioned ≈ 243 g
Swaps for rolled oats
Instead of oats
- Quick oats: The same amount. Softer, more cake-like cookies and bars with less chew; mushy in granola and overnight oats.
- 1 ½ tsp baking powder
Swaps for baking powder
Instead of baking powder
- Baking soda + cream of tartar: ¼ tsp baking soda + ½ tsp cream of tartar for each 1 tsp baking powder. Rises the same if you don't let the batter sit.
- Baking soda + buttermilk or yogurt: ¼ tsp baking soda for each 1 tsp baking powder, and swap ½ cup of the recipe's milk for buttermilk or thinned yogurt. Good rise with a light tang.
- Self-rising flour: Use it for the flour and leave out the baking powder and salt. Each cup has about 1½ tsp baking powder and ¼ tsp salt built in, so it only fits recipes close to that ratio.
- 2 tsp ground cinnamon
Swaps for ground cinnamon
Instead of cinnamon
- Pumpkin pie spice or apple pie spice: The same amount. Mostly cinnamon, with ginger, nutmeg and allspice or cloves: a little spicier.
- Ground allspice or nutmeg: About ¼ the amount. Much stronger and different, but warm in the same way.
- ¼ tsp ground nutmeg
Swaps for ground nutmeg
Instead of nutmeg
- Ground mace: A little less. Made from the same fruit; slightly sharper.
- Pumpkin pie spice or allspice: The same amount. Warmer and more cinnamon-forward.
- ½ tsp kosher salt
Swaps for kosher salt
Instead of salt
- Table salt or fine sea salt: About half as much as Diamond Crystal kosher, about ¾ as much as Morton kosher. The same saltiness when measured this way.
- Salt by weight: 1 tsp is about 6 grams of table salt, 5 grams of Morton kosher, 3 grams of Diamond Crystal kosher. The most reliable way to swap, especially in baking and brines.
- 2 large eggs
Swaps for eggs
Instead of eggs
- Flax egg: 1 tbsp ground flaxseed + 3 tbsp water for each egg. Binds well but gives less lift, so bakes are a little denser and flatter, with a mild nutty taste and brown flecks.
- Chia egg: 1 tbsp chia seeds + 3 tbsp water for each egg. Works like a flax egg: good binding, little lift, slightly denser crumb.
- Unsweetened applesauce: ¼ cup for each egg. Moister and denser, with a soft, slightly gummy crumb if you swap more than one egg.
Cooking for an allergy? Check every label.
- 1 ¾ cups milk
Swaps for milk
Instead of milk
- Unsweetened soy milk: The same amount. The closest plant milk for baking: its protein helps things brown and set.
- Unsweetened oat milk: The same amount. Creamy and mild with a hint of sweetness.
- Unsweetened almond milk: The same amount. Thinner and less rich, so cakes are a little paler and drier.
Cooking for an allergy? Check every label.
- ⅓ cup brown sugar, packed ≈ 73 g
Swaps for brown sugar
Instead of brown sugar
- White sugar + molasses: 1 cup granulated sugar + 1 tbsp molasses (light) or 2 tbsp (dark). The same as store-bought.
- White sugar: The same amount. Crisper, paler cookies with less caramel flavor.
- Light and dark brown sugar: The same amount, either way. Dark brown sugar tastes stronger and makes bakes a bit darker and moister.
- 3 tbsp butter, melted
Swaps for butter
Instead of butter
- Plant-based butter sticks: The same amount. The closest swap.
- Refined coconut oil: The same amount: solid when the butter is soft or cold, melted when it is melted. It is all fat, so bakes are a bit more tender and rich, with no butter flavor.
- Vegetable oil: 3 tbsp oil for every 4 tbsp (¼ cup) melted butter. Cakes and muffins come out moister and stay soft longer, without a buttery taste.
Cooking for an allergy? Check every label.
- 1 tsp vanilla extract
Swaps for vanilla extract
Instead of vanilla extract
- Vanilla bean paste: The same amount. Stronger, with visible vanilla seeds.
- Vanilla bean: The seeds of 1 bean for each 1 tbsp extract. A deeper, floral flavor and visible seeds.
- Alcohol-free vanilla: The same amount. Made with glycerin; a slightly milder taste.
- 2 medium apples, peeled, cored and diced (about 2 cups)
- ½ cup walnuts, chopped (optional) ≈ 59 g
Swaps for walnuts
Instead of nuts
- Another nut: The same amount. Pecans are sweeter and softer, walnuts slightly bitter, almonds firmer and milder.
- Toasted pumpkin or sunflower seeds: The same amount. Smaller and crunchier, with an earthy taste.
- Leave them out, or use chocolate chips or toasted oats: The same amount (or none). Leaving nuts out doesn't change how a batter bakes.
Cooking for an allergy? Check every label.
Weights from USDA FoodData Central cup weights. Counted things (eggs, cloves, cans) stay as counts, and salt stays in spoons: kosher and flaky salts weigh very differently by brand.
Different pan? Written for 8x8-inch square; rescale the amounts for an 8x8, 9x13, round, loaf or sheet pan.
Cooking for a crowd? Pans, timing and salt for 12 to 50.
Missing something? Tap Swaps next to an ingredient, or see all substitutions.
Steps
Kid helper. A child can do steps 2, 3, 4, 5 and 6: no knife, no heat. Steps marked “Grown-up” use a knife or heat. Cooking with kids
- Heat the oven to 375°F (190°C).375°FGrown-up: heatan 8x8 baking pan.
Grease (how to grease and flour a pan)
Grease and flour a pan Coat a pan with fat (and sometimes flour) so baked goods release cleanly. 1. Rub a thin layer of soft butter or shortening into every corner with a paper towel, or use baking spray.2. For cakes, add a spoonful of flour, tilt and tap the pan until it is coated.3. Turn the pan over and tap out the extra flour.4. For chocolate cakes, use cocoa instead of flour so there is no white film. Done when: Every surface, corners included, is lightly coated with no bare spots or thick clumps. How to grease and flour a baking pan: mistakes to avoid - Stir the oats, baking powder, cinnamon, nutmeg and salt in a large bowl.Kid step
- In another bowl,Kid stepthe eggs, then whisk in the milk, brown sugar, melted butter and vanilla until the sugar dissolves.
whisk (how to whisk)
Whisk Beat ingredients with a whisk to mix them smoothly or to add air. 1. Use a bowl big enough to whisk without splashing; set it on a damp towel to stop it spinning.2. Hold the whisk loosely and move it in quick circles or side to side, touching the bottom.3. For lumpy mixtures, add liquid a little at a time and whisk after each.4. For sauces on the stove, keep the whisk moving across the whole bottom of the pan. Done when: The mixture is even with no lumps or streaks of egg. How to whisk: mistakes to avoid - Pour the wet ingredients into the oats and stir to combine.Kid step
- Kid stepin the apples and walnuts, if using.
Fold (how to fold)
Fold Combine a light mixture (whipped cream, beaten whites) or chunky add-ins into a batter gently, so it stays airy. 1. Put the lighter mixture on top of the heavier one, or add the flour or chips.2. Cut a rubber spatula straight down through the middle to the bottom of the bowl.3. Sweep it across the bottom and up the side, then turn it over on top.4. Turn the bowl a quarter turn and repeat.5. Stop as soon as no streaks remain. Done when: There are no dry streaks or white blobs, and the mixture still looks light and puffy. Safety: Batters with raw eggs or flour aren't safe to eat raw.How to fold ingredients into a batter: mistakes to avoid - Spread the mixture evenly in the pan.Kid step
- Bake until golden on top, the apples are tender and the center is set.375°F⏱ Bake: 40 minGrown-up: heat
- Let it cool before slicing.⏱ Cool: 10 minGrown-up: knife, heat
- Cut into 8 squares and serve warm.Grown-up: knife, heat
Tap an underlined word for how to do it, or see all techniques.
Tips
- Firm, sweet-tart apples like Honeycrisp, Gala or Granny Smith hold their shape best.
- Leave the nuts out for school lunch boxes with nut rules.
Storage
Refrigerate up to 4 days or freeze squares up to 3 months.
Make ahead
Reheat a square in the microwave 45 to 60 seconds until warm.
Cook once, eat twice: Double it (16 servings instead of 8), eat half and freeze the other half. It keeps 3 months frozen, by the storage note above. Print a freezer label · More freezer meals
How long leftovers keep, and freezing and reheating: leftovers and storage. In season: apples (August to November).
Quick answers
- Can I freeze it?
Yes. Refrigerate up to 4 days or freeze squares up to 3 months.
Answered from this recipe's own storage, make-ahead and swap notes.
Estimated nutrition per serving
- Calories
- 270 1,130 kJ
- Protein
- 7 g
- Carbohydrates
- 39 g
- Fiber
- 5 g
- Sugars
- 17 g
- Fat
- 9 g
- Saturated fat
- 4.5 g
- Sodium
- 280 mg
Whole recipe, 8 servings: about 2,130 calories.
Estimate from USDA FoodData Central; not medical or dietary advice. Based on 11 of 11 ingredients.
How we estimate
We add up USDA FoodData Central values for each measured ingredient as written and divide by the recipe's 8 servings, so changing the servings or units here doesn't change a serving. Brands, swaps, trimming and cooking all change the real numbers.
Not counted: butter (to taste or as needed); walnuts (optional).
Estimated cost
About $0.60 a serving
About $4.65 for the recipe as written (8 servings).
Estimate; prices vary by store and region. U.S. average prices for September 2026 from BLS Average Price Data and USDA ERS Purchase to Plate prices updated with the BLS Consumer Price Index. Priced: 6 of 11 ingredients, 98% by weight.
How we estimate
Each measured ingredient is weighed as in the nutrition estimate and priced at the U.S. average: BLS's average price where BLS publishes one, else USDA ERS's Purchase to Plate price for 2017-18 raised to September 2026 with the CPI for that food group. Whole packages, store brands, sales and regions all change the real cost: treat it as a ballpark.
- apples $1.80 ERS
- rolled oats $1.45 ERS
- milk $0.45 BLS
- eggs $0.40 BLS
- butter $0.35 BLS
- brown sugar $0.25 ERS
Not priced (no official average price we can match, so not in the total): baking powder, ground cinnamon, ground nutmeg, kosher salt, vanilla extract.
Not counted: butter, walnuts (optional, or to taste).
More dishes for less: cheap eats.
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Gear for this recipe
- See price on Amazon: 8x8 square baking pan (opens Amazon)
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Cleanup score 3/5 (some cleanup): 3 things to wash, 8x8 pan, bowl 1, bowl 2.
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