Preheat the oven to 350ºF and grease an 8x6-inch baking dish with a tiny bit of coconut oil or cooking spray.
In a small bowl, whisk well the 2 tablespoons ground flaxseed and 1/3 cup warm water and set aside.
In a large bowl, combine the 1 1/2 cups quick oats, 1 teaspoon baking powder, 1/2 teaspoon baking soda, A pinch of kosher salt, and 2 teaspoons pumpkin spice mix.
In a small bowl, quickly mash the 2 overripe bananas and add them to the bowl with the oat mixture.
Add in all the remaining ingredients (1/4 cup creamy peanut butter - mashed, 1 teaspoon vanilla extract, 1/2 cup honey, and 3/4 cup coconut milk) together with the flaxseed mixture, and stir well to incorporate.
Transfer the batter to the prepared baking dish. Bake for 20-25 minutes, or until fully set and the top is golden.
Once the oatmeal is ready, allow it to cool before cutting it into squares. Serve topped with sliced bananas, chopped 1/3 roasted unsalted peanuts, and extra peanut butter drizzle.
Video
Notes
Storing leftovers: Place any leftover baked oatmeal in an airtight container or plastic, in the fridge for up to 4 days.
Freeze: Store individual servings in an airtight, freezer-safe container or freezer-safe bag for up to 3 months.
Reheat: Place individual slices in the microwave for about 1 to 4 minutes, depending on whether it’s at room temperature or frozen.