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Soft baked oatmeal squares made with rolled oats, milk, eggs, and berries ready for reheating
Isaac blogger

Easy 1-Bowl Baked Oatmeal

A soft, sliceable baked oatmeal made in one bowl with rolled oats, milk, eggs, and berries. Ideal for make-ahead breakfasts, family mornings, and easy meal prep.
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Prep Time 5 minutes
Cook Time 35 minutes
Total Time 45 minutes
Servings: 9
Course: Breakfast
Cuisine: American
Calories:
Ingredients Method Notes

Ingredients
  

  • 1¾ cups milk
  • 2 large eggs
  • ½ cup pure maple syrup
  • ¼ cup melted butter or coconut oil
  • ¼ cup unsweetened applesauce or mashed banana
  • 3 cups old-fashioned rolled oats
  • 1 tsp baking powder
  • 1 tsp ground cinnamon
  • 1 tsp vanilla extract
  • ¼ tsp salt
  • 1½ cups fresh or frozen mixed berries
  • ½ cup chopped nuts (optional)

Method
 

  1. Before You Begin
  2. Prepare your cookware as needed. Cooking times and results may vary depending on your equipment and ingredients.
  3. Use old-fashioned rolled oats for best texture. Allow baked oatmeal to rest briefly before slicing.
  4. Preheat the Oven
  5. Preheat the oven to 350°F (177°C). Lightly grease a 9×9-inch or 11×7-inch baking dish.
  6. Mix Wet Ingredients
  7. In a large bowl, whisk together the milk, eggs, maple syrup, melted butter, applesauce, vanilla, and salt until smooth.
  8. Add Dry Ingredients
  9. Stir in the rolled oats, baking powder, and cinnamon until just combined.
  10. Fold in the Berries
  11. Gently fold in the berries, then pour the mixture into the prepared baking dish.
  12. Bake
  13. Bake 30–35 minutes, until edges are set and the center appears softly set with a slight jiggle.
  14. Rest and Serve
  15. Allow the baked oatmeal to rest briefly before slicing and serving.

Notes

  • Use rolled oats for proper texture; other oat types may soften too quickly.
  • Bake just until the center is set to help prevent dryness; cooking times may vary by oven.
  • Frozen berries can be added directly without thawing, but distribute evenly for consistent baking.
  • Allow baked oatmeal to cool slightly before storing to help maintain texture.
  • Store leftovers refrigerated in a sealed container and keep chilled when not serving.
  • Reheat portions gently until warmed through; results may vary depending on appliance.
  • Freeze portions in airtight wrapping if needed; thaw under refrigeration before reheating.
  • Discard if smell, texture, or appearance changes.