Parmesan-Crusted Grilled Cheese Sandwiches with Caramelized Onions
"We’re not being dramatic when we say this is probably the best grilled cheese sandwich on the face of the planet. Yes, there are rich balsamic-caramelized onions wedged between melty Cheddar on the inside, but it is what’s happening on the outside that’s truly revolutionary. Before hitting the pan, the bread is slathered in butter and doused in Parmesan cheese, then it’s grilled to crispy, crunchy perfection. Let’s just say there’s a reason we’ve given this sandwich the nickname Million Dollar Grilled..."
INGREDIENTS
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1 tablespoon vegetable oil
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1/3 cup plus 1 tablespoon butter, softened
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1 large onion, sliced (about 2 cups)
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2 teaspoons balsamic vinegar
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1/2 teaspoon sugar
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1/4 teaspoon salt
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8 slices sourdough bread
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2 cups shredded sharp Cheddar cheese (8 oz)
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1 1/2 cups finely shredded Parmesan cheese (6 oz)
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