Apple Crumble Ingredients Crumble Topping 1 cup all purpose flour 3/4 cup brown sugar light or dark 1 teaspoon baking powder ½ teaspoon salt ½ teaspoon ground cinnamon 8 tablespoons unsalted butter melted Filling 2 ½ pounds Granny Smith apples peeled, cored, and sliced or diced into bite sized pieces (about 6 to 7 cups) ½ cup granulated sugar or brown sugar 1 tablespoon lemon juice 2 tablespoons corn starch or all purpose flour ½ teaspoon salt 1 teaspoon ground cinnamon Instructions Preheat oven