Preheat the oven to 375 °F. Lightly spray a 9x13-inch baking dish with nonstick spray.
In a large bowl, whisk together the applesauce and maple syrup.
Whisk in the egg and egg white.
Whisk in the espresso powder, vanilla extract, baking powder, cinnamon, and salt.
Stir in the milk
Stir in the oats
Stir in the chocolate chips
Pour the mixture into the prepared baking dish. Bake at 375 °F for about 45 minutes, until the oatmeal has turned golden-brown. A toothpick inserted into the center of the oatmeal should come out clean.