im good with the classic: cheese, LTOP, mustard/mayo
when im being fat and fancy I go for bacon, mushrooms, grilled peppers/onions (or haystacks), spicy mayo or some kinda pepper sauce, fried egg, etc
cheese and bread type is constantly interchangeable....we kinda do this shit so we change up a lot
if im making patties myself, I like to mix either some chopped bacon or italian sausage to my ground beef
and yes, we cook them shits medium