Peanut Butter Cookies
["1 c. brown sugar", "1 c. granulated sugar", "1/2 lb. butter or margarine", "1 c. peanut butter", "2 eggs", "2 tsp. soda in 1 tsp. cider vinegar", "1/2 tsp. vanilla", "1 tsp. salt", "3 c. flour"]
["Mix sugars, eggs and peanut butter together. Add soda to 1 teaspoon cider vinegar and add to sugar mixture. Add vanilla. Mix flour and salt and add to sugar mixture. Roll dough into balls the size of walnuts and place on ungreased cookie sheet. Flatten with fork. Bake at 350\u00b0 for 9 to 10 minutes."]
["brown sugar", "sugar", "butter", "peanut butter", "eggs", "soda", "vanilla", "salt", "flour"]