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1
For the mushroom topping: Add the butter, oil, thyme, onions, chiles, salt and pepper to a pan over medium heat.
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2
Cook until the onions are tender and the thyme is fragrant, 6 to 8 minutes.
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3
Add the mushrooms and cook until they lose some moisture and wilt, about 5 minutes.
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4
Transfer the mushrooms to a plate and wipe out the pan to reuse.
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5
For the patty: Whisk the Worcestershire, salt, pepper and garlic in a small bowl.
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6
Break up the ground chuck in a separate large bowl.
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7
Gently combine the Worcestershire and the ground chuck.
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8
Form the ground chuck into a ball.
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9
Heat the pan over medium-high heat.
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10
Place the ball of ground chuck between two sheets of parchment or plastic wrap.
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11
Flatten the ball to a size a little larger than the flatbreads, using a rolling pin or the bottom of a glass.
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12
Place the flattened patty in the pan and cook on one side until the edges begin to curl under a bit.
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13
Flip the patty and cook the other side to your desired amount of doneness, about 5 minutes total.
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14
Adjust an oven rack to the center of the oven and preheat to 350 degrees F. Place one of the flatbreads on a sheet of aluminum foil.
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15
Evenly layer the American cheese on top and sprinkle with the bacon.
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16
Place the patty on top and evenly spread the mushroom mixture on top.
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17
Place the smoked mozzarella on top.
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18
Place the second flatbread on top and tightly wrap the sandwich inside the foil and bake, flipping the sandwich halfway through the cooking process, about 10 minutes.
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19
Remove the sandwich from the oven and let rest 5 minutes before opening.
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20
Cut the sandwich in to 4 wedges with a knife.
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21
Serve with ketchup.