Peel, core and slice the apples. Preheat the oven to 315°.
In bowl, combine brown sugar, white sugar, baking powder and beaten egg. Stir everything together until it’s coarse.
Take 1 spoonful of the flour mixture sprinkle over the sliced apples. Sprinkle the cinnamon as well. Gently toss the whole thing together.
Transfer the apples into a baking dish. Spread the rest of the flour mixture on top. Drizzle the melted butter on top.
Bake it in the oven for an hour.