Step 1

APPLES: In a bowl, toss together all the ingredients for the apples; set aside. Line a 12x9.5 pan with parchment paper; set aside.

Step 2

CRUMBLE: Position a rack in the center of the oven and preheat the oven to 350ºF. Mix the oats, flour, sugars, baking powder, and ground cinnamon together in a large bowl. Pour in the melted butter and stir to combine until you form a sand-like crumb. Press two-thirds of the prepared crumb mixture into the prepared pan. You want to make sure the crust is tightly packed in.

Step 3

BAKE: Top with the apple mixture and sprinkle the remaining crumb mixture on top. Bake for 50-60 minutes. Remove from the oven and place on a wire rack for one hour. I usually stick mine in the refrigerator for a bit after that to cool them down completely before cutting into pieces.