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Apple cinnamon baked oatmeal with walnuts

Breakfast

Apple Cinnamon Baked Oatmeal

Warm, sliceable oatmeal with tender apples and a crisp walnut top—breakfast for the whole week in one pan.

Developed for DishGal · Updated 2026-08-17

Prep15 min
Cook35 min
Total50 min
Cost$1.05

Directions

  1. Prepare

    Heat oven to 375°F. Grease an 8-inch square baking dish.

  2. Mix dry

    Stir oats, baking powder, cinnamon, and salt in the dish.

  3. Mix wet

    Whisk milk, eggs, maple syrup, butter, and vanilla. Pour over oats and stir.

  4. Add fruit

    Fold in apples and raisins. Press apples below the liquid and scatter walnuts on top.

  5. Bake

    Bake 32 to 38 minutes until the center is set. Rest 10 minutes before slicing.

Why this works

Why it worksEggs turn oatmeal into neat, reheatable squares.
Why it worksApples cook directly in the custardy oat mixture.
Why it worksWalnuts toast on top and add contrast.

Swaps & notes

Easy swaps

  • Use pears, blueberries, or diced peaches.
  • Use dairy-free milk and coconut oil.
  • Replace walnuts with pumpkin seeds for nut-free.

Cook notes

  • Old-fashioned oats give the best structure; quick oats are softer.
  • Dice apples small so they cook through.

Storage

Refrigerate 5 days or freeze slices up to 3 months. Reheat with a splash of milk.

Questions

Can I assemble it overnight?

Yes, but the texture will be softer because the oats absorb liquid. Refrigerate covered and bake in the morning.

Can I make it less sweet?

Reduce maple syrup to 1/4 cup; the apples provide additional sweetness.

Can I use steel-cut oats?

Not in this formula. They need more liquid and a longer bake.

Apple Cinnamon Baked Oatmeal
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1. PrepareHeat oven to 375°F. Grease an 8-inch square baking dish.
2. Mix dryStir oats, baking powder, cinnamon, and salt in the dish.
3. Mix wetWhisk milk, eggs, maple syrup, butter, and vanilla. Pour over oats and stir.
4. Add fruitFold in apples and raisins. Press apples below the liquid and scatter walnuts on top.
5. BakeBake 32 to 38 minutes until the center is set. Rest 10 minutes before slicing.