Peanut Butter Cookies

Mix:
1/2 cup of butter
1/2 cup of firmly packed brown sugar
1/2 cup of sugar
1 egg
1 cup of peanut butter
1/2 teaspoon of salt
1/2 teaspoon of baking soda
1/2 teaspoon of vanilla
1 1/2 cups of flour

Roll into balls, place on cookie sheet and press down with a fork. Bake at 375 for 8-10 minutes.