Mix ground chuck with chilies, onion, garlic, salt and pepper, and blend well, but gently.
Form into 6 patties and grill, uncovered, about 4 inches from medium coals or other heat source until cooked to the degree desired.
Turn once half way through cooking time.
(To yield a juicy burger, do not mash burgers with spatula and check temperature with thermometer or T-stick.) One minute before burgers are done, add cheese and continue to cook until cheese is melted.
Serve with grilled corn on the cob and a freshly tossed salad.