In a large skillet over medium heat, sauté the onions in the oil until very caramelized and dark golden brown, about 15-20 minutes. Deglaze the pan with Worcestershire sauce and season with salt and pepper. Remove from heat and let cool.
In a bowl, combine sour cream, mayo, celery salt, garlic and onion powders. Fold in the onions. Garnish with crumbled bacon and chopped scallions, and serve with warm kettle potato chips and celery and carrots sticks or any other raw vegetables alongside for dipping.