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).