filling: melt butter in skillet add onion cook 4min add mushrooms, thyme, and salt cook until liquid evaporates cool Burgers: divide meat into 8 portions shape into 3 1/2" patties spoon quarter filling in center and spreand leaving 1/2" border top with another patty and pinch together.
cover and chill in freezer 15minutes season sides with salt and pepper grill 6-8 minutes per side top with cheese during last 4 minutes grill rolls.
2min serve burgers on rolls with lettuce and tomato.
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Stuffed Philly Cheeseburger (YUM) (cont.)