Preheat oven to 375 degrees.In a bowl, mix together dry ingredients. Oats, brown sugar, baking soda, cinnamon, and chocolate chips.Fold frozen berries into dry mix.Dump dry mixture into a greased, 9" x 13" panIn a separate bowl, whisk together melted butter, almond milk, egg, and vanilla extract.Pour the mixture over the oatmeal mixture making sure to evenly distribute it. You can shake the pan a little to make sure it is getting distributed everywhere.Slice your banana into ¼ inch slices and spread them out over the oatmeal.Bake for 30-35 minutes or until it looks fully cooked.Sprinkle with additional brown sugar and serve warm.