Step 1

Preheat the oven to 350°F. Line an 8×8-inch baking dish with parchment paper.

Step 2

In a large bowl, whisk together the eggs, milk, applesauce, sugars and vanilla. Stir in the oats, granulated sugar, brown sugar, baking powder, salt, and cinnamon. Let mixture sit 15 minutes to meld the flavors and allow the oats to absorb some of the moisture.. Fold in mix-in's, if using.

Step 3

Spread evenly in the baking dish. Bake 30 to 35 minutes, or until edges are starting to brown. Let cool before slicing.