Tante Susan's Peanut Butter Chocolate Chip Cookies

1/2 cup butter
1 cup peanut butter
1 cup brown sugar
2 eggs
1 T vinegar
1 tsp vanilla
2 cups flour
1/2 tsp salt
2 tsp baking soda
1 cup chocolate chips

Mix and roll into balls, flatten with fork. Bake 8-10 minutes at 350.