In a mixing bowl, toss together the apples, white sugar, 1 teaspoon flour, and cinnamon. Then sprinkle with water and pour into an 8x8-inch baking dish.
3.
Make the crumble topping by stirring together the oats, 1/3 cup flour, brown sugar, baking powder, baking soda, and melted butter. Distribute over the apples in the baking dish.
