Colored sugar; if desired Mix brown sugar, margarine, applesauce and egg in large bowl until smooth. Stir in remaining ingredeints except icing and colored sugar. Cover and refirgerate at least 1 hour until chilled. Heat oven to 375F. Grease cookie sheet. roll dough 1/8-inch think on floured cloth-covered surface. Cut with 2-1/2-inch cookie cutters. Place about 1 inch apart on cookie sheet. Bake 7-9 minutes or until edges are light brown. Immediately remove from cookie sheet. Cool completely on wire rack. Frost with icing (directions below); sprinkle with colored sugar. Let icing dry about 2 hours before stacking cookies. Makes about 3 dozen cookies. ICING: Sprinkle gelatin on cold water in 1-1/2-quart saucepan to soften. Stir in sugar. Heat to rolling boil, reduce heat. Simmer uncovered 10 minutes, stirring frequently. Pour hot mixture over confectioner's sugar in small bowl; beat until smooth. Beat in remaining ingredients on high speed, scraping bowl frequently, until soft peaks form and icing is glossy. Frost cookies. ----