To make ahead, make cookie cups through step 3. Store covered up to 2 days at room temperature, then fill with milk just before serving.
Mix it up! Try peanut butter cookie dough and chocolate milk or sugar cookie dough, white vanilla baking chips and strawberry milk for the perfect combination.
Have only one mini muffin pan? Refrigerate rest of the dough while baking and cooling the first batch. Cool pan completely, then bake remaining dough, adding 1 to 2 minutes to bake time.