1Heat oven to 375°F. In large bowl, stir Cookie ingredients until stiff dough forms. Shape dough into about 60 (1-inch) balls. Place on ungreased cookie sheet 2 inches apart.
2Bake 7 to 9 minutes or until set. Cool 2 minutes; remove from cookie sheet to cooling rack. Cool completely, about 30 minutes.
3In small bowl, mix Filling ingredients. Spoon mixture into decorating bag fitted with 3/8-inch star tip. Pipe filling around outer edge of bottom of 1 cookie. Top with another cookie, bottom side down. Do not press together. Repeat to use up cookies.