PREHEAT oven to 350° F. Grease 24 mini-muffin cups.
PLACE squares of dough into prepared muffin cups; press down to make a deep well.
BAKE for 12 minutes or until edges have set (centers will be soft). While still warm, fill cookie cups with marshmallows, morsels and nuts. Cool completely in pan on wire rack. With tip of butter knife, remove cookie cups from muffin pan(s).
VARIATION: Use NESTLÉ TOLL HOUSE Refrigerated Oatmeal Raisin Cookie Bar Dough and replace morsels or nuts with chopped, dried fruit.