Preheat oven to 375 degrees.
Combine the dry ingredients in a large bowl (oats, salt, cinnamon, baking powder).
Combine the wet ingredients (egg, 1 mashed banana, milk, vanilla).
Pour the wet into the dry and mix well.
Spray a pie dish with cooking spray or grease with butter. Pour oat mixture in.
Top with sliced bananas.
Bake for about 26 minutes.
After 26 minutes, increase heat to broil, sprinkle oatmeal with 1 heaping tbsp brown sugar and broil for 3-4 minutes.