Set oven: Preheat the oven to 375°F.
Prepare pan: Spray an 8-inch square baking dish with cooking spray.
Mix ingredients: In a large bowl, mix together the oats, baking powder, cinnamon and salt. Add in milk, maple syrup, egg, coconut oil, vanilla and mashed banana. Stir well to combine.
Add remaining ingredients: Gently fold in 1 cup strawberries, 1/2 of your banana slices and 1/8 cup of chocolate chips.
Pour into baking dish: Carefully pour oatmeal mixture into the prepared baking dish.
Add toppings: Scatter the remaining strawberries, banana slices and chocolate chips on top.
Bake: Bake for 50-60 minutes or until the middle of the bake is set (it might still be slightly wet from the strawberries but that’s okay). The top/edges will be golden.
Serve: Remove from the oven and let cool for a few minutes. This will allow the baked oatmeal to set a bit more. Portion and serve. Top with additional fresh strawberries, banana and a splash of milk.