INGREDIENTS
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6 slices sandwich bread
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6 slices swiss cheese, cut in half diagonally
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6 slices provolone cheese, cut in half
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½ stick unsalted butter, divided
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1 teaspoon olive oil
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2 large onions, sliced
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1 can beef broth
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2 tablespoons white wine (optional)
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¼ teaspoon dried thyme
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salt and pepper, to taste