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 and fully incorporated.
03 - Fold in the cooled caramelized onions, chives, and parsley. Stir until well combined and evenly distributed throughout the mixture.
04 - Cover and refrigerate the dip for at least 1 hour to allow flavors to meld and the mixture to firm up slightly for optimal texture.
05 - Transfer the dip to a serving bowl, garnish with extra chopped chives, and serve accompanied by sturdy potato chips for dipping.