
Warmth a big cast-iron skillet over medium-high. Add the mushrooms and place a second heavy skillet on high of the mushrooms. (Wrap the highest skillet in foil for simpler clean-up.) Prepare dinner, flipping the mushrooms each two minutes. As soon as the mushrooms are flattened, about 4 minutes in, sometimes press down firmly on the highest skillet to advertise browning. (For those who do that earlier than they’re flat, you danger splitting the mushroom.) Proceed flipping and urgent till the mushrooms are browned and skinny, 8 to 10 minutes, decreasing the warmth if they start to char. If the mushrooms turn into matte and wrinkly, drizzle on one other tablespoon of oil.