Casseroles
My sister clipped this from a magazine in 1977 and never stopped making it, and it's still the first thing requested at family reunions.
Grandma pours a box of Jiffy mix into the skillet and the whole house smelled like Sunday. Just 3 ingredients.
Lay a tube of raw crescent dough in the pan with 3 other ingredients and the pan is gone before it cools.