Melt 1 tablespoon of the unsalted butter in a broiler-safe large skillet over medium-high heat. Add the mushrooms and sear, undisturbed, until the bottoms are well-browned, about 3 minutes. Season with 1/2 teaspoon kosher salt and 1/4 teaspoon red pepper flakes, and cook, stirring once or twice, until the mushrooms are browned all over and just tender, about 3 minutes.





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