Tillie Scotch Bars
["1/2 c. margarine (1 stick)", "1/4 c. sugar", "1/4 c. brown sugar", "1/2 tsp. vanilla", "1 egg yolk", "1/2 c. flour", "1/2 c. rolled oats", "1 (6 oz.) pkg. butterscotch bits or chocolate bits", "1/2 c. walnuts"]
["Cream margarine, then gradually add both sugars and beat well. Add vanilla and egg yolk.", "Beat until soft and fluffy.", "Stir in flour and rolled oats and blend well."]
["margarine", "sugar", "brown sugar", "vanilla", "egg yolk", "flour", "rolled oats", "butterscotch bits", "walnuts"]