Form ground beef into 3 patties, pressing down in the center (they puff when they cook).

Season with salt & pepper.

Grill over medium high heat, turning once.

Using instant read meat thermometer, remove from heat 5-10 degrees ahead of desired doneness.

Cover and rest for 5 minutes (burger will continue to cook).

Heat skillet to high heat and add oil.

Allow the oil to come up to temp, then add garlic and shallot stirring quickly for 1-2 minutes until the shallots soften.

Add the mushrooms and scallions and toss until the mushrooms caramelize and brown.

Remove from the heat and add the butter and thyme.

Season with salt & pepper.

Place burger on favorite bun or bed of greens.

Top with 2 slices of bacon and a generous spoonful of sautéed mushrooms.

Top with slice of Swiss cheese.