Mix well with spoon in large bowl 3/4 cup shortening (part butter), 1 cup sugar, 2 eggs, and 1 tsp. vanilla. Blend in 2 1/2 cups Gold Medal flour (do not use self rising flour), 1 tsp. baking powder and 1 tsp. salt.
Cover dough; chill at least 1 hour.

Heat oven to 400F.

Mix with fork in small bowl 1 egg yolk and 1/4 tsp water. Divide mixture among custard cups. Add a few drops of food color to each cup to make red, green, blue, yellow and orange paint.

Roll chilled dough 1/8" thick on lightly floured cloth-covered board. Cut with cookie cutters or make your own interesting shapes. Place on ungreased baking sheet.

Using different paintbrushes (brushes that have never been used for actual paint) for each color of paint, paint designs on cookies. If paint thickens, add few drops of water. Bake cookies 6 to 8 minutes or until light brown on edges. Cool on wire rack.

4 dozen cookies