[header] How to top muffins [title] Combine flour, sugar, and butter in a food processor. [step] Measure out 1 cup (240 ml) of flour , 1 cup (240 ml) of brown sugar, then cut 1 stick of butter into small pieces and place all the ingredients in a food processor. Pulse the mixture together until it forms fine crumbs.
[title] Mix in additional ingredients for flavor and texture variations. [step] You can use your flour, sugar, and butter base as a crumble by itself, or you can add in some cinnamon, pecans, or rolled oats into the food processor as well.