Heat oven to 350°F. Shape roll of dough into 32 (1-inch) balls; on ungreased cookie sheets, place balls 2 inches apart.
Bake 8 to 11 minutes or until light golden brown. Cool 1 minute; remove from cookie sheets. Cool completely, about 10 minutes.
For each sandwich cookie, spread 1 tablespoon frosting on bottom of 1 cookie. Top with second cookie, bottom side down; press together gently. If desired, sprinkle frosting with decorator sprinkles. Store loosely covered.