1 c. white sugar
1/2 c. brown sugar
1/2 c. butter
1/2 c. shortening
1 egg
2 c. flour
1 tsp. cream of tartar
2 tsp. baking soda
1/2 tsp. salt
1 tsp. vanilla
2 c. chocolate chips

Mix and drop on greased cookie sheet. Bake 8-10 minutes at 325 degrees.