01 -
Heat your oven to 350°F and give a 9x13 inch baking dish a light coating of cooking spray. This prevents sticking and makes cleanup easier later.
02 -
In a large mixing bowl, combine your sliced apples with both sugars, flour, cinnamon, nutmeg, and vanilla. Gently toss everything together until each apple slice is nicely coated with the sweet, spiced mixture.
03 -
Transfer your seasoned apple mixture into the prepared baking dish, spreading it out evenly. Don't pack it down too firmly - you want the apples to have room to cook properly.
04 -
In another large bowl, whisk together the oats, flour, brown sugar, cinnamon, salt, and baking powder until well combined.
05 -
Pour the melted butter over your dry topping ingredients and stir until everything is evenly moistened and no dry flour spots remain. The mixture should hold together when squeezed.
06 -
Sprinkle the crumb topping evenly over your apples, making sure to cover all areas. Bake uncovered for 40-45 minutes until the top is golden brown and you can see the apple juices bubbling around the edges.
07 -
Let the apple crisp rest for about 5 minutes before serving. This brief cooling time helps the filling set up nicely and prevents it from being too runny when you dig in.