1/2 c. butter
1/2 c. shortening
1 c. white sugar
1 c. brown sugar
2 eggs
3 c. flour
1/2 tsp. salt
3 tsp. cream of tartar
2 tsp. baking soda
1 tsp. vanilla
12 oz. chocolate chips, peanuts, raisins, or M&M'S®

Cream butter, shortening, and sugar. Add eggs, then add dry ingredients, vanilla, and chips. Bake at 350 degrees for 8-10 minutes.