Mix together the White Cheddar & Bacon dip, shredded cheese, and diced pimentos. Set aside.
Form beef into ½-pound patties. Make a little indentation in the center of each one. Season with salt and pepper, and spritz with grilling spray.
Preheat grill to high heat. Add the burgers and cook 4 minutes on one side, and 3 on the other for medium doneness.
Meanwhile spritz the cut side of each bun with grilling spray, and grill for 10-15 seconds. Watch them closely to prevent them from burning.
Add all toppings and serve immediately.