These top burger spots serve rich, indulgent Midwestern-style patties. A handful of restaurants offer these Midwestern specialties, and thankfully not all those chains are only in the actual Midwest, but nationwide: Here are four spots with the most delicious butter burgers, according to diners. Steak ‘n ShakeSteak ‘n Shake has the Butter Single and Butter Double Steakburger on the menu. “That sounds MUCH closer to an actual Wisconsin Butter Burger actually is. SmashburgerSmashburger toasts its burger buns in butter for that rich butter burger taste.