1/2 c. butter
1/2 c. shortening
3/4 c. brown sugar
3/4 c. white sugar
1 egg, beaten
2 1/2 c. flour
2 tsp. baking soda
1 tsp. cream of tartar
1/4 tsp. salt
1 tsp. vanilla
2 c. chocolate chips or M&M'S®

Cream butter, shortening, brown sugar and white sugar together. Add beaten egg. Sift and add dry ingredients. Add vanilla and chocolate chips. Drop by teaspoon on cookie sheet. Do not flatten. Bake at 350 degrees for 10-15 minutes.