"This dish gives you the satisfaction of your grandmother's creamed onions with the added bonus of earthy mushrooms...."
INGREDIENTS
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1/4 cup extra virgin olive oil
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2 pounds mixed mushrooms (white button, cremini, oyster), sliced
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1 teaspoon herbs de Provence (or dried thyme)
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1 1/2 teaspoon salt, divided
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1/2 teaspoon pepper, divided
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3 tablespoons unsalted butter
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6 pounds leeks, root end trimmed
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1 cup white wine
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2 cups milk
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1 cup heavy cream
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2 tablespoons cornstarch