01 -
Preheat oven to 350°F. Lightly spray a 9x13 baking dish with non-stick baker's spray.
02 -
In a large mixing bowl, combine apple slices, brown sugar, flour, granulated sugar, cinnamon, nutmeg, and vanilla. Gently fold to coat apples evenly with the sugars and spices.
03 -
Spread apple mixture in an even layer in the prepared baking dish. Don't pack the filling too tightly.
04 -
In another large bowl, combine oats, flour, brown sugar, cinnamon, salt, and baking powder. Stir to mix.
05 -
Pour melted butter into the oat mixture and stir until fully incorporated with no dry spots remaining.
06 -
Evenly distribute the crisp topping over the apple filling, covering it completely. Bake uncovered for 40-45 minutes until golden brown with bubbly filling.
07 -
Allow to cool for 5 minutes before serving to let filling set and thicken.