Caramelized Onion Dip

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2 tablespoons unsalted butter

2 tablespoons olive oil 

3 pounds yellow onions, cut in half lengthwise and crosswise into 1/4-inch slices 

2 tablespoons brown sugar 

Salt and freshly ground pepper 

1/4 cup red wine vinegar 

3 dashes hot sauce, optional 

One 8-ounce package cream cheese, softened 

1 cup (8 ounces) sour cream 

Chopped chives, for garnish, optional