INGREDIENTS
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- 1 tablespoon butter
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- 1 tablespoon olive oil
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- 1 small onion, sliced
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- 8 ounces cremini mushrooms, sliced
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- 2 cloves garlic, chopped
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- 1 teaspoon thyme, chopped
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- 1/4 cup white wine or broth
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- salt and pepper to taste
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- 1 tablespoon parsley, chopped
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- 1/2 teaspoon truffle oil (optional)
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- 1 cup fontina or gruyere, shredded
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- 1/4 cup parmigiano reggiano, grated
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- 4 slices bread
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- 2 tablespoon butter