Preheat the oven to 375° F. In an 8x11 inch baking dish, combine the oats, cinnamon, baking powder and salt.
In a large mixing bowl, mash the bananas, then add the almond milk, peanut butter, maple syrup, flaxseed and vanilla extract. Allow the mixture to stand for 5 minutes for the flaxseed to set.
Pour over the wet ingredients over the oat mixture and stir to combine.
Bake uncovered in the preheated oven until the top of the oatmeal is golden and the mixture is set, about 30-35 minutes. Remove and allow it to cool for 5 minutes.
Serve with drizzled peanut butter and banana slices, if desired.
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Notes
Storage: The baked oatmeal can be stored in the fridge for up to 5 days. This makes it an ideal breakfast meal prep to make on Sunday night for the week. When ready to eat, just reheat individual servings in the microwave for 30-45 seconds.Substitutes: For best results, follow the recipe as is. However here are some common substitutes that would work well in this recipe.
Make it your own: You can change up the milk to what you have on hand or your taste preferences.
Make it gluten-free:Use certified gluten-free rolled oats.