1 c. oil
1 c. butter
1 c. sugar
1 c. brown sugar
2 eggs
2 tsp. vanilla
4 c. flour
4 tsp. cream of tartar
2 tsp. baking soda
12 oz. chocolate chips

Cream oil, butter, sugars, and eggs, and vanilla. Add flour, cream of tartar, baking soda, chocolate chips. Bake at 350 degrees for 8 to 10 minutes.