Preheat oven to 350 degrees. Blend butter until smooth then add egg and dry cookie mix and continue blending until a dough is formed. Press dough evenly into disposable cake pan. If you do not have a disposable cake pan, shape the cookie dough into a flat 8” disc and place on a cookie sheet lined with parchment paper.
Bake 25-30 minutes, or until the cookie is evenly golden across the top. Cool completely. To make the frosting, blend butter and yogurt together in a bowl until combined. Add dry frosting mix and blend a minute more until smooth and creamy.
Set aside 3 tablespoons of frosting. Divide remaining frosting in half and use natural food dye to color one portion yellow and one orange. Use a butter knife to evenly spread white frosting into a 3 inch circle in the middle of the cookie cake. Next spread orange frosting evenly around white circle, about 1 1/2 wide. Spread yellow frosting around remaining outside edge of cookie. Serve immediately!