Heat the oil in a large skillet over medium heat; add the onions, minced garlic, and 1/2 teaspoon of salt. Cook and stir until the onions are caramelized to a nice golden brown, about 30 minutes. Remove the onions from the heat and cool.
Mix together the sour cream, mayonnaise, Worcestershire sauce, garlic powder, pepper, and remaining salt. Stir in the onions when they are cool. Cover and refrigerate the dip for at least 2 hours before serving. Serve with Deep River Snacks kettle chips.