Melt in Your Mouth Chocolate Chip Cookies
1 cup margarine
1 cup oil
1 cup brown sugar
1 cup white sugar
2 eggs
2 tsp. vanilla
4 cups flour
1 T. cream of tartar
2 tsp. baking soda
1 tsp. salt
1 (12 oz.) pkg. chocolate chips

Cream first four ingredients, add eggs and vanilla.  Beat well.  Sift next four ingredients, and add to creamed mixture.  Add chocolate chips.  Bake at 350 for 10 minutes.