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.

New, no ratings yet0 reviewsby Simmerbee Kitchen

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.

    More for butter

    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.

    More for 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.

    More for baking powder

  • 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.

    More for cinnamon

  • 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.

    More for nutmeg

  • 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.

    More for salt

  • 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.

    All 5 swaps for eggs

    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.

    All 5 swaps for milk

    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.

    All 4 swaps for brown sugar

  • 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.

    More for butter

    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.

    All 5 swaps for vanilla extract

  • 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.

    More for nuts

    Cooking for an allergy? Check every label.

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

  1. Heat the oven to 375°F (190°C).
    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
    an 8x8 baking pan.
    375°FGrown-up: heat
  2. Stir the oats, baking powder, cinnamon, nutmeg and salt in a large bowl.
    Kid step
  3. In another bowl,
    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
    the eggs, then whisk in the milk, brown sugar, melted butter and vanilla until the sugar dissolves.
    Kid step
  4. Pour the wet ingredients into the oats and stir to combine.
    Kid step
  5. 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
    in the apples and walnuts, if using.
    Kid step
  6. Spread the mixture evenly in the pan.
    Kid step
  7. Bake until golden on top, the apples are tender and the center is set.
    375°F⏱ Bake: 40 minGrown-up: heat
  8. Let it cool before slicing.
    ⏱ Cool: 10 minGrown-up: knife, heat
  9. 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

Quick answers

Can I freeze it?

Yes. Refrigerate up to 4 days or freeze squares up to 3 months.

What can I swap?
  • Instead of butter: Plant-based butter sticks, the same amount.
  • Instead of oats: Quick oats, the same amount.

Cooking for an allergy? Check every label.

Answered from this recipe's own storage, make-ahead and swap notes.

Estimated nutrition per serving

Calories
270
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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Cleanup score 3/5 (some cleanup): 3 things to wash, 8x8 pan, bowl 1, bowl 2.

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