Combine the mayo and BBQ sauce in a small bowl.
In another bowl, mix the crumbled bacon, 2 Tablespoons of the mayo/BBQ mixture, onion and steak seasoning.
Combine the bacon mixture with the ground beef
Form into 4 hamburger patties
Grill burgers until cooked to desired temperature
Top with cheese and cook until cheese is melted
Spread the remaining mayo/BBQ sauce on the buns
Add the burger and whatever other toppings you like on your burger (lettuce, tomato, onion, etc.)