"The humble onion is the star ingredient in this simple Southern casserole — already sweet Vidalias are sliced into rings and baked for an hour, making them even sweeter Sharp Cheddar, Swiss and Parmesan bring a salty richness to the 3 pounds of caramelized vegetables (much like their juxtaposition in French onion soup but with far less hands-on work) A mix of pantry spices creates a barbecue-inspired blend, but this lineup can be swapped with a number of seasonings, including Cajun..."
INGREDIENTS
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2 teaspoons brown or granulated sugar
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1 teaspoon chopped fresh thyme, or 1/2 teaspoon dried thyme, plus more for serving
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1 teaspoon smoked paprika
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1 teaspoon garlic powder
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1/2 teaspoon mustard powder
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1/4 teaspoon ground cayenne
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Salt and black pepper
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1 lemon, zested and halved (optional)
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3 pounds Vidalia onions (3 to 5 onions, depending on size)
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1 tablespoon olive oil
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1 cup (4 ounces) shredded sharp Cheddar
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1 cup (4 ounces) shredded Swiss cheese
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1/3 cup (1 ounce) grated Parmesan
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3 tablespoons unsalted butter, cut into small cubes