Shape dough into 24 (1 1/2-inch) balls. For each cookie, flatten ball into palm of hand to about 2-inch circle. Press 1 Peanut Butter Cup®, bottom side down, into center. Wrap edges of dough around it to completely enclose; reshape into ball. Place 2 inches apart on large ungreased cookie sheets. Press M&M’s™ candies on tops of cookies.