Mama's Grilled Cheese Sandwich White Bread American Cheese Butter Mayo Onion - sliced thin Salt & Pepper Butter the inside of one slice of bread and put Mayo on the inside of the other slice. Place one slice of cheese, a little sliced onion and Salt & Pepper. Toast the sandwiches in the broiler. * Mama always served this simple, delicious sandwich with Campbell's Cream of Tomato Soup. Yum! The best comfort food there is. Thank You Mama!