Mom'S Jello Cookies
["4 c. sifted all-purpose flour", "1 tsp. double-acting baking powder", "1 1/2 c. butter", "1 c. sugar", "1 (3 oz.) pkg. Jell-O (red or green)*", "1 egg", "1 tsp. vanilla"]
["*Do not substitute lo-cal type."]
["flour", "double-acting baking powder", "butter", "sugar", "egg", "vanilla"]