In a large bowl, beat together margarine and sugars. Add eggs and flavoring; beat well. Mix baking soda, cream of tartar and flour together in a medium-sized bowl. Gradually add to creamed mixture. Cover bowl and chill at least 2 hours. Roll out 1/4 inch thick onto floured waxed paper. Cut into your favorite dinosaur shapes (or any other shapes) and place on ungreased cookie sheets. Brush with egg substitute and sprinkle with colored sugars, mixing several colors on each cookie as desired. Bake at 375° for 8 to 9 minutes, or until very lightly browned. Immediately remove from cookie sheets and cool on wire rack.

Yield: 90 (2- to 3-inch) cookies.