Here is one for the chocolate/peanut butter lover, old or young. I say old first; this was served as the dessert on our lunch tray, 1st grade through 12th grade, usually on "Pizza Friday." And one would not think twice by propositioning a trade of their rectangle slice of frozen pizza for your peanut butter square. (This is where that term you learned in social studies class, "bartering", came into good use!) Can be served for up to 12-24 servings; 24 small servings or 12 nice big servings, like the ones served in the cafeteria at Whitehall School District, Pennsylvania. To this day, they are still served! (Prep/cook time does not include chill time).