Place candy pieces in medium microwave-safe bowl. Microwave at MEDIUM (50%) 1-1/2 to 2 minutes, or until chocolate is melted when mixture is stirred.
Stir in marshmallows and graham cracker pieces until well coated. Drop by spoonfuls into miniature paper muffin cups (1-3/4 inches in diameter). Cover; refrigerate until firm. About 2-1/2 dozen snacks.