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 brown sugar.
Whisk in the egg and egg whites.
Whisk in the vanilla extract, baking powder, cinnamon, ginger, clove, and salt.
Stir in the milk
Stir in the oats
Peel, core and chop the apples. I used gala apples, but any type of sweet baking apple will do fine.
Stir the apples into the oatmeal mixture.
Pour the whole mixture into the prepared baking dish. Put it in the oven and bake for about 35 minutes. You'll know it's done when the edges are golden-brown and a knife or skewer inserted into the center of the oatmeal comes out clean.