Food & Cooking Recipes Dessert & Treats Recipes Crumble Topping 3.4 (174) Close Credit: Lisa Cohen Use this sweet, buttery crumble topping on Rhubarb Pie or any other fruit pie in place of a top crust. Directions In a medium bowl, mix flour, light-brown sugar, granulated sugar, and salt. With your hands, work in butter until large, moist clumps form. Chill, covered, until ready to use.