Can't get to wisconsin to enjoy a mouthwatering ooey-gooey butter burger? It's super-easy to make them at homeWisconsin has long been famous for its dairy production, producing more cheese and butter than any other state, so it's no wonder the butter burger was created in that state. An authentic butter burger is made with lean ground beef, preferably sirloin, and a generous amount of butter. Hot cooked chopped onions are usually layered on the burgers along with a slice of cheese if you like. If you crave additional toppings, feel free to add them to the bottom bun before you add the hamburger patty. Butter adds flavor and succulent texture to these burgers, so lean ground beef (about 90 percent lean) is the best choice.