In a food processor or bowl, combine flour, butter, and brown sugar until well mixed.
1 cup all-purpose flour, ½ cup unsalted butter, ½ cup light brown sugar
Transfer the mixture to the refrigerator until ready to use.
When ready, break the topping into pea-sized pieces (a little large is ok, too).
Gently press the topping onto your pie, crisp, muffin batter, etc.
Bake according to your recipe's instructions.