Split your butter in half and place each half in a separate pot.
Melt your butter and in the pot that you'll be placing your mushrooms, pour in 3 T of wine.
Once butter is melted, put onions in one pot and mushrooms in the pot with the wine.
While onions and mushrooms are cooking, season your burgers with cracked pepper and garlic salt.
Either grill or broil your burgers until cooked to your preference. We like medium.
Cook your onions are until they are soft
Cook your mushrooms until the majority of liquid disappears in the mushrooms.
Melt your cheese over your burger.
Top with mushrooms, onions, bacon (if you have it), and BBQ Sauce.