Preheat the oven to 400˚ F. Melt the butter in a cast-iron skillet over medium heat. Add the green onions, red onion, Vidalia onion, white onion and brown sugar and sauté, stirring occasionally, 10 to 15 minutes. Add the vinegar and Worcestershire sauce and cook until the onions are very soft and a caramel color, 4 to 5 minutes. Stir in the cream cheese until it is melted into the onions. Remove the mixture to a large bowl, then stir in the sour cream, mayonnaise and chives.
Transfer the dip to an 8-inch square baking dish; top with the Parmesan. Bake until bubbling, 15 to 20 minutes. Serve with crostini or crudités.
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Photograph by Mike Garten
Tools You May Need
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