1 c. butter
1 c. vegetable oil
1 c. sugar
1 c. powdered sugar
2 eggs
4 c. flour
1 tsp. baking soda
1 tsp. cream of tartar
1 tsp. salt
1 tsp. vanilla
1 (12 oz.) pkg. chocolate chips
Sugar

Combine first 5 ingredients. Beat until smooth. Combine flour, soda, tartar and salt; add to butter mixture. Beat until smooth. Stir in vanilla and chips. Shape into 1 inch balls and roll in sugar. Place 2 inches apart on ungreased cookie sheets. Bake at 375 degrees for 10 to 12 minutes. 8 1/2 dozen.