01 - In a large skillet, melt butter and olive oil over medium heat. Add the chopped onions along with a pinch of salt. Cook, stirring frequently, until the onions are golden brown and deeply caramelized, about 25 to 30 minutes. During the last 2 minutes, stir in the minced garlic. Remove from heat and let cool completely.
02 - In a mixing bowl, combine the sour cream, mayonnaise, cream cheese, Worcestershire sauce, onion powder, garlic powder, salt, and pepper. Stir until the mixture is smooth and all ingredients are thoroughly blended.
03 - Gently fold the cooled caramelized onions into the creamy base. Mix until the onions are evenly distributed throughout the dip.
04 - Cover the bowl tightly and refrigerate for at least 1 hour to allow the flavors to meld together.
05 - Before serving, give the dip a good stir. Garnish with chopped chives or green onions if desired. Serve chilled alongside potato chips, pretzels, or an assortment of fresh vegetables.