1. Preheat oven to 375°F. For cookies, combine shortening, butter, egg yolks and vanilla extract. Blend in cake mix gradually. Add 1 teaspoonful water at a time until dough is rolling consistency. Divide dough into 4 balls. Flatten one ball with hand; roll to 1/8-inch thickness on lightly floured surface. Cut with graduated star cookie cutters. Repeat using remaining dough. Bake large cookies together on ungreased baking sheet. Bake 6 to 8 minutes or until edges are light golden brown. Cool cookies 1 minute. Remove from baking sheet. Repeat with smaller cookies, testing for doneness at minimum baking time.
2. For frosting, tint Vanilla frosting with green food coloring. Frost cookies and stack, beginning with largest cookies on bottom and ending with smallest cookies on top. Rotate cookies when stacking to alternate corners. Decorate as desired with colored sugar crystals and assorted colored candies and decors.
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