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Cinnamon Apple Baked Oatmeal is a delicious, filling make-ahead breakfast for fall — loaded with chewy oats, tender apples, crunchy walnuts, and cinnamon. |

Cinnamon Apple Baked Oatmeal

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5 from 2 reviews

  • Author: Sam | Ahead of Thyme
  • Total Time: 40 minutes
  • Yield: 6-9 servings
  • Diet: Vegetarian


Cinnamon Apple Baked Oatmeal is my favourite make-ahead breakfast for fall! Loaded with soft and chewy oats, tender apples, crunchy walnuts, and warm cinnamon, this breakfast is wholesome, filling, and nutritious.


For the oatmeal:

  • cooking spray (or 1 tablespoon butter)
  • 2 ¼ cups old fashioned oats
  • 1 ½ teaspoons cinnamon
  • 1 teaspoon baking powder
  • 1/4 teaspoon salt
  • 1 1/2 cups milk
  • ½ cup unsweetened applesauce
  • ¼ cup maple syrup
  • 2 large eggs
  • 3 tablespoons unsalted buttermelted
  • 1 teaspoon vanilla 
  • 1 cup applesdiced
  • 1/3 cup walnutschopped

Optional toppings:

  • whipped cream or Greek yogurt
  • apples, sliced
  • nut butter
  • maple syrup or honey


  1. Preheat oven to 350 F. Grease an 8-inch square baking pan (2-quarts) with butter or cooking spray.
  2. In a large mixing bowl, combine oats, cinnamon, baking powder, salt, milk, applesauce, maple syrup, eggs, butter, and vanilla. Stir until mixed evenly together.
  3. Fold in apples and walnuts.
  4. Transfer the batter to the prepared baking dish. Bake for 30-35 minutes, or until oatmeal is set and golden.
  5. Let it cool for 5 minutes before serving. Slice into 6 rectangles or 9 squares and top with whipped cream or yogurt, sliced apples, and a drizzle of nut butter. You can also add a drizzle of maple syrup if desired.


How to store: Allow the baked oatmeal to cool completely, then cover (or transfer to an airtight container) and store it in the refrigerator (without any toppings) for up to 1 week.

How to reheat: Reheat in a 350F preheated oven for about 10 minutes until warm, or in the microwave in 30 second increments until warmed through.

How to freeze: Allow the oatmeal to cool to room temperature, then wrap the pan with plastic cling wrap and aluminum foil and freeze for up to 3 months. You can also slice into individual portions first and wrap each slice tightly in plastic cling wrap and then store in an airtight container or freezer bag. Thaw overnight in the refrigerator before reheating.

Recipe update 2023. This recipe was tweaked and updated completely. For the original recipe: 1 tablespoon butter (or butter spray), 2 gala apples, peeled and cut into ½-inch cubes, 1 teaspoon cinnamon, 1 cup quick oats, 1/3 cup walnuts, crushed, 1/4 teaspoon salt, 1/4 cup brown sugar, 1 + 1/2 cups milk, 1 egg. Instructions: Preheat oven to 350 F. Grease a 2-quart oval casserole dish or ramekin with butter or butter spray, then add apples. Toss with cinnamon and bake for 15-20 minutes, or until softened. Remove the dish from the oven and add oats, walnuts, and salt. Stir until evenly dispersed. In a separate bowl, whisk together brown sugar, milk, and egg. Pour on top of oats, making sure everything is submerged in liquid. To make a streusel topping, combine 1/2 cup flour, 1/4 cup brown sugar, 1/4 teaspoon salt, and 4 tablespoons butter (at room temperature and cut into cubes) in a small bowl. Use your hands to gently work the ingredients together, crumbling the butter into pea-sized pieces and working quickly so that it doesn’t melt. Sprinkle as much of the streusel as you’d like on top of the oatmeal, then bake for 20-25 minutes, or until most of the liquid as been absorbed. Sprinkle 2 tablespoons brown sugar on top, then place under the broiler for just a couple minutes until the sugar has melted. Watch carefully so it doesn’t burn. Serve hot as is or with a splash of milk.

  • Prep Time: 10 minutes
  • Cook Time: 30 minutes
  • Category: Breakfast
  • Method: Bake
  • Cuisine: American