Prepare Your Baking Dish: Preheat your oven to 375°F (190°C). Lightly grease an 8×8-inch square baking pan with cooking spray to prevent sticking.
Combine the Dry Ingredients: In a large mixing bowl, stir together the rolled oats, half of the chopped pecans, baking powder, cinnamon, and sea salt until well blended.
Mix Wet Ingredients: In a separate bowl, whisk together the almond milk, maple syrup, egg (or flaxseed mixture), melted coconut oil, and vanilla extract until smooth. Then, gently fold in the sliced bananas.
Combine Wet and Dry: Pour the wet mixture into the dry ingredients and stir thoroughly until everything is evenly combined.
Transfer to Baking Pan: Carefully pour the oatmeal batter into the prepared baking dish, spreading it out evenly with a spatula.
Add the Crunchy Topping: Sprinkle the remaining chopped pecans evenly over the top for a delightful crunch once baked.
Bake to Golden Perfection: Place the pan in the oven and bake for 35 to 40 minutes, or until the top is golden brown and the oatmeal is set.
Cool and Serve: Remove the dish from the oven and allow it to cool for a few minutes before slicing. Serve warm, with an optional drizzle of extra maple syrup for added sweetness.