Preheat the oven to 375 °F. Lightly spray a 9x13-inch baking dish with nonstick spray.
In a large bowl, whisk together the applesauce, brown sugar, and ¼ cup maple syrup.
Whisk in the egg and egg whites
Whisk in the cinnamon, baking powder, salt and vanilla extract.
Stir in the milk
Stir in the rolled oats
Stir in the ½ cup of chopped pecans
Pour the oatmeal mixture into the pan and bake for about 45 minutes. The oatmeal is done when the edges are lightly browned and a knife or skewer inserted into the center comes out clean.