Chewy Peanut Butter Bars
["1/2 c. peanut butter", "1/2 c. margarine", "1 1/2 c. sugar", "2 eggs, beaten", "1 T. vanilla", "1 c. self-rising flour", "1 c. chocolate frosting (optional)"]
["Melt peanut butter and margarine in bowl over hot water or in microwave.", "Add remaining ingredients.", "Stir until blended. Spread into greased and floured 9x13 pan.", "Bake at 350 degrees for 25 to 30 mins.", "Cool completely.", "Add chocolate frosting if desired.", "Cut into squares."]
["peanut butter", "margarine", "sugar", "eggs", "vanilla", "flour", "chocolate frosting"]