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Cinnamon Baked Oatmeal Sheet Cake for Easy Meal Prep

Close-up of a moist square slice of cinnamon baked oatmeal sheet cake with a crunchy topping on a white plate.
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Make this simple, sliceable baked oatmeal cake on a sheet pan for a quick, make-ahead breakfast perfect for feeding a crowd or meal prepping for the week.

Ingredients

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  • 2 cups rolled oats (not instant)
  • 1 cup all-purpose flour
  • 1/2 cup packed brown sugar
  • 2 teaspoons baking powder
  • 1 teaspoon ground cinnamon
  • 1/2 teaspoon ground nutmeg
  • 1/4 teaspoon salt
  • 1/2 cup unsalted butter, melted
  • 1/4 cup maple syrup or honey
  • 2 large eggs
  • 1 1/2 cups milk (dairy or non-dairy)
  • 1 teaspoon vanilla extract
  • Optional: 1/2 cup chopped pecans or apples

Instructions

  1. Preheat your oven to 375 degrees Fahrenheit. Lightly grease a 9×13 inch baking pan or line it with parchment paper for easy removal.
  2. In a large bowl, whisk together the rolled oats, flour, brown sugar, baking powder, cinnamon, nutmeg, and salt.
  3. In a separate medium bowl, whisk together the melted butter, maple syrup, eggs, milk, and vanilla extract until combined.
  4. Pour the wet ingredients into the dry ingredients. Stir gently until just combined. Do not overmix; a few dry spots are acceptable. If using, fold in the pecans or apples now.
  5. Pour the batter evenly into the prepared sheet pan. Spread it out with a spatula.
  6. Bake for 30 to 35 minutes, or until the top is golden brown and a toothpick inserted near the center comes out clean.
  7. Let the baked oatmeal cool in the pan for at least 15 minutes before slicing into squares.

Notes

  • For a coffee cake style oatmeal, mix 1/4 cup flour, 1/4 cup brown sugar, 1/2 teaspoon cinnamon, and 2 tablespoons cold butter until crumbly, then sprinkle over the batter before baking.
  • This recipe stores well. Cover and refrigerate leftovers for up to 5 days. Reheat individual portions in the microwave for 30 seconds.
  • If you prefer a sweeter topping, drizzle with a simple glaze made from 1/2 cup powdered sugar mixed with 2 tablespoons milk after the oatmeal has cooled slightly.

Nutrition

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