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Heat butter in large skillet over medium-high heat and saute the
mushrooms and onions for 7-8 minutes, or until nicely browned.
Add 1 tablespoon Worcestershire and thyme to pan. Stir to
combine and remove from heat.
Place ground chuck in a medium bowl and add 1 teaspoon
Worcestershire sauce and salt and pepper to taste. Use your hands
to mix and shape into 4 patties.
Spray grill or grill pan lightly with cooking spray and heat over
medium-high heat. Place burgers on grill and cook 4 to 5 minutes.
Flip and cook about 3 more minutes, add cheese and cook until
desired degree of doneness.
Spread dijon mustard on bottom of each bun, top with lettuce and
burger patty. Pile mushroom-onion mixture on top.
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