Preheat the oven to 375 degrees Fahrenheit and spray an 8x8 or 9x9 inch baking pan with non-stick spray.
Whisk the eggs together in a large bowl then pour in the milk, applesauce and maple syrup and whisk to combine.
3 eggs, 1 ½ cups milk, 1 cup applesauce, ½ cup maple syrup
Add in the baking powder, cinnamon, apple pie spice and salt and whisk again.
1 teaspoon baking powder, 1 teaspoon ground cinnamon, 1 teaspoon apple pie spice, ½ teaspoon salt
Finally mix in the oats and ¾ of the apples.
3 cups old-fashioned oats
Cover the bowl and let it sit for 10 minutes then pour it into the baking pan and sprinkle the remaining apple pieces on top.
2 apples
Bake for 30-40 minutes or until the center is no longer jiggly.
Let it rest for 15 minutes before slicing and serving with maple syrup if desired.