In apple crumble, the streusel topping is made from a mixture of butter, flour, sugar, and baking spices, while in apple crisp, oats are added to the same mixture for a crunchier texture.
Preheat the oven to 350 degrees F (175 degrees C). Toss apples with white sugar and ½ teaspoon cinnamon in a medium bowl to coat; pour into a 9-inch square baking dish. Mix brown sugar, oats, flour, ...