This healthy peanut butter banana baked oatmeal is soft, fluffy, and honestly tastes like peanut butter cake for breakfast. It’s made with wholesome, everyday ingredients, sweetened naturally (no refined sugar!), and perfect for meal prep. Bake once and you’ve got a cozy, protein-packed breakfast ready to heat up all week long.
Preheat: Preheat your oven to 350°F (175°C). Lightly grease a 9-inch square dish with cooking spray or avocado oil.
Mix Wet Ingredients: In a large bowl, combine the mashed banana, peanut butter, maple syrup, milk, egg (or omit for a vegan option), and vanilla extract. Whisk until fully combined.
Add Dry Ingredients: Stir in the rolled oats, cinnamon, baking powder, salt, and ground flaxseed (if not using an egg). Mix until all ingredients are well incorporated. All peanut butter brands are different, so make sure your batter is not too stiff. If you use a thicker peanut butter, you may need to add a dash more milk. Look at the reference picture below to compare.
Pour: Pour the mixture into the greased baking dish, spreading it evenly.
Bake: Bake for 35 to 45 minutes, until the top is golden brown and the center is set.
Serve: Allow the baked oatmeal to cool for 5 minutes before serving. Optionally, drizzle with extra peanut butter and garnish with banana slices. Enjoy your delicious peanut butter baked oatmeal!