Keep the grill on medium high heat while you prep the burger patty.
In a large bowl mix together and combine sirloin, onion, grill seasoning, liquid smoke, Worcestershire sauce, garlic, adobo sauce, and chipotle pepper.
Divide the mixture into six equal parts and make patties.
Season the patties with salt and pepper then grill them on the preheated grill.
Once they are cooked through, place the cheese slices on the patties and cook for another minute.
Place the patties inside the burger buns and serve.