"Tennessee onions feature sweet Vidalia onions, caramelized and elevated with a trio of gooey, melted cheeses. They're rich, tasty, and oh-so-comforting...."
INGREDIENTS
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1 teaspoon dried thyme
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1 teaspoon dried parsley
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1 teaspoon garlic powder
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1/2 teaspoon dried oregano
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1/2 teaspoon salt
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1/4 teaspoon black pepper
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1/4 teaspoon mustard powder
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1/4 cup unsalted butter
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3-4 large sweet onions (preferably Vidalia)
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1 cup sharp cheddar cheese, shredded
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1 cup mozzarella cheese, shredded
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1/2 cup Parmesan cheese, grated