Mix:

1/2 c. butter or shortening
2 eggs, beaten
1/2 to 1 c. sour cream or sour milk
1 1/2 c. brown sugar, packed
1 tsp. vanilla

Sift and add 3 cups flour, 1/2 teaspoon baking powder, 1 teaspoon baking soda, 1/2 teaspoon salt. Add 1 cup chocolate chips. Add nuts (optional). Drop by teaspoon on greased cookie sheet. Bake at 350 degrees for 15 minutes.