1/2 c. butter
1/4 c. shortening
1/2 c. brown sugar
1/2 c. sugar
2 eggs
2 tsp. vanilla
1 1/2 c. all purpose flour
1/2 tsp. baking soda
1/2 tsp. baking powder
1/2 tsp. salt
12 oz. chocolate chips

Preheat oven to 325 degrees. Do not use self-rising flour. Mix together and chill for 3 hours. Line a pizza pan with foil (greased). Spread dough to within 1 inch of edge. Bake for 25 minutes. Cover with foil and bake 15 minutes more.