INGREDIENTS
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1sheet puff pastry (half a 17.3-ounce package), thawed
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4tablespoonsolive oil
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10ouncesassorted mushrooms (such as button, cremini, shiitake, and oyster), sliced
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1shallot, sliced
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kosher salt and black pepper
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1/4cupdry white wine
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4ouncesGruyère or sharp white Cheddar, grated (1 cup)
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1teaspoonDijon mustard
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1teaspoonwhite wine vinegar
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4ouncesmixed greens (6 cups)
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2radishes, thinly sliced
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1tablespoonchopped fresh chives