Buttermilk Baking Powder Biscuits
["4 c. flour", "6 tsp. baking powder", "1/2 tsp. baking soda", "1 tsp. salt", "2/3 c. margarine", "1 1/2 c. buttermilk or milk plus 3 Tbsp. vinegar"]
["Mix together flour, baking powder, baking soda and salt.", "Mix in margarine until crumbs form.", "Add buttermilk.", "Roll to 1 1/2-inches thick.", "Cut with an old fashioned glass or donut cutter.", "Bake on an ungreased cookie sheet for 12 minutes at 450\u00b0."]
["flour", "baking powder", "baking soda", "salt", "margarine", "buttermilk"]