INGREDIENTS
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3 tablespoons butter
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1 1/2 pounds onions, halved, thinly sliced (about 5 cups)
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4 fresh thyme sprigs
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1 1/2 pounds portobello mushrooms, stemmed, caps halved and cut crosswise into 1/4-inch-thick strips
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3 tablespoons Cognac or brandy
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3 garlic cloves, minced
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8 cups canned vegetable broth
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1 cup dry white wine
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18 1-inch-thick slices French-bread baguette, toasted
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8 ounces soft fresh goat cheese, room temperature