An easy crumble topping recipe combines 1 cup of brown sugar, 1 cup of flour, 2 teaspoons of cinnamon, 1/2 cup walnuts, 2/3 cup unsalted butter and 1/2 cup of oats. Combine ingredients in a bowl with a fork until crumbly. You can top pies, muffins, cakes and crisps.
Alternatively, make a crumble by combining 3/4 cup all-purpose flour, 1/3 cup packed light-brown sugar, 3 tablespoons granulated sugar, a pinch of salt and 6 tablespoons cold unsalted butter, cut into small pieces. In a medium bowl, combine the flour, light-brown sugar, granulated sugar and salt. With your hands, work in butter until moist, large clumps form. Cover, and chill until ready to use.
A crumble recipe using oats and fruit is made by using 8 tablespoons or 1/2 cup of butter, 1 cup of brown sugar, 3/4 cup flour, 3/4 cup quick or regular oatmeal, 1/2 teaspoon of cinnamon and 1/4 teaspoon of salt. Combine all ingredients together, and spread the mixture on prepared fruit. Bake in the oven at 350 to 375 degrees Fahrenheit. If the crumbs begin to brown, loosely cover the pan with foil. Remove the foil for the last few minutes of baking, to allow the crumbs to crisp.