French Onion Dip

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2 tablespoons unsalted butter

2 Vidalia onions, sliced into 1/4-inch-thick rings

2 large shallots, sliced into 1/8-inch-thick rings

3 cloves garlic, minced

2 cups sour cream

1 cup mayonnaise

1 teaspoon celery salt

1 teaspoon Worcestershire sauce

Kosher salt and freshly ground pepper

Chives, finely chopped, for garnish

Potato chips, for serving