Preheat the oven to 350. Spray a 9x13 baking dish with non-stick cooking spray.
In a mixing bowl, whisk together the eggs, oil, milk, then stir in the sugar, quick cooking oats and rolled oats. Stir to combine, then add the flour, baking powder and salt. Stir to combine, then fold in the mashed bananas and about 2/3 of the mini chocolate chips. (Save the rest of the chocolate chips to sprinkle on top of the batter in the pan before baking.)
Transfer the batter into the prepared baking dish, then sprinkle the remaining chocolate chips over the top.
Bake in the preheated oven for 30 to 35 minutes, or until toothpick comes out clean in the middle.
Serve Banana Chocolate Chip Baked Oatmeal with milk, cream, or yogurt.