01 - Melt the butter in a large skillet over medium heat. Add the diced onions, salt, pepper, and sugar. Cook, stirring occasionally, until the onions are deep golden brown and caramelized, about 25–30 minutes. Remove from heat and let cool completely.
02 - In a mixing bowl, combine sour cream, cream cheese, mayonnaise, Worcestershire sauce, and garlic powder. Mix until smooth.
03 - Fold in the cooled caramelized onions, chives, and parsley. Stir until well combined.
04 - Cover and chill the dip for at least 1 hour to allow flavors to meld.
05 - Transfer the dip to a serving bowl, garnish with extra chives, and serve with potato chips.