01Preheat grill to medium-high heat and coat with oil. Season ground beef with salt and pepper and gently mix to combine. Divide beef into 8 patties. Sprinkle 1 ounce pepper jack cheese in center of four patties and top with remaining four patties, pinching around edges to seal.
02Grill burgers 7-9 minutes per side, until caramelized on outside and cooked through to desired temperature. While burgers cook, grill poblanos until charred and tender, about 5 minutes. Remove burgers from grill and let rest 5 minutes.
03While burgers cook, prepare poblano cream sauce: Carefully remove seeds and stem from grilled poblanos and finely chop. Combine poblanos with cream cheese, mayonnaise and garlic. Season with salt and pepper to taste.