2/3 c. shortening
2/3 c. butter, softened
1 c. sugar
1 c. brown sugar, packed
2 eggs
2 tsp. vanilla
3 1/2 c. flour
1 tsp. baking soda
1 tsp. salt
1 c. chopped nuts (optional)
12 oz. semi-sweet chocolate chips

Preheat oven to 350 degrees. Mix first 6 ingredients. Stir in remaining dry ingredients. Drop dough by teaspoonfuls 2 inches apart on ungreased cookie sheet. Bake 8-10 minutes.