Use streusel to top coffee cakes, muffins, pies, crumbles, or crisps.
Combine in a small bowl and blend until crumbly:
Add, if desired:
Sprinkle the streusel over the batter or dough and bake as directed.
Whisk to combine in a medium bowl:
Add:
Work the butter into the flour with your fingers until the mixture forms medium-sized clumps. Refrigerate until ready to use. Sprinkle the streusel over the batter or dough and bake as directed.