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1
Heat olive oil in a skillet over medium high heat.
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2
Add the mushrooms and cook until soft, about 6 minutes.
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3
Remove from heat.
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4
Gently mix beef, ketchup, garlic powder, salt, and pepper, in a medium bowl.
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5
Divide into 4 portions and press each between 2 pieces of parchment or waxed paper until about 1/4 thick (you want them roughly the same dimensions as the bread youre using).
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6
Heat a large skillet, preferably cast iron, over medium-high heat with the vegetable oil.
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7
Working in 2 batches, cook patties, pressing gently, until browned but still pink in the center, about 2 minutes per side.
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8
Transfer to a plate.
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9
Repeat with the second batch.
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10
Set patties aside.
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11
In a small bowl mix the mayonnaise and Sriracha and set aside.
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12
Wipe out the skillet and reduce heat to medium.
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13
Spread the inside of each bread slice with 1 teaspoon of the mayo mixture.
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14
Top 4 slices of bread with a slice of cheddar, a beef patty, some mushrooms, a slice of Muenster cheese and then bacon.
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15
Close up the sandwiches and add 1 teaspoon of butter to the skillet.
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16
Place the sandwiches (do them in batches if your skillet isnt big enough) in the skillet and weigh them down with a foil-covered heavy pan.
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17
Cook until the bottom slice is golden brown, about 3 minutes.
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18
Remove weighted pan add more butter into the skillet.
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19
Flip the sandwiches and weigh them down again.
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20
Cook until the other side is golden brown and cheese is melted, about 3 minutes.
