Please choose the correct ending to complete the given sentence: Food and Entertaining: [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.

Ending1: [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. Ending2: [substeps] While you can use whole wheat or fresh peas, regular flour is best, since it's finer and tastier. [title] Fold the mixture in with a pastry brush. Ending3: [substeps] Adding the butter and sugar is almost like blending water into flour, but should be added gradually to prevent it from combining poorly. It's ok if it isn't smooth or crumbly at this point. Ending4: This process should take approximately 1 to 2 minutes. [substeps] To make an even top on the muffins, you'll need to use more or less flour and produce.

Answer format: ending1/ending2/ending3/ending4