I run a CS, and we added grilled cheese to the menu. In 2 weeks that they were on the menu, we sold 3 large loafs of bread. I figured it was about 40 sandwiches. Spent about $7 on supplies, made $60... not a bad turn around. In colder weather, we added hot apple cider, hot chocolate and hot coffee.... sold great. Pizza and hot dogs another good seller.