Mix together beef, bacon crumbles, green chiles, salt, and pepper. Divide mixture into four equal parts and shape into patties, creating a small well in the center of each patty.
Cook burgers 3-4 minutes per side.
While the burgers are cooking, butter tops and bottoms of hamburger buns.
In the last minute of cooking, add the buns to the grill butter-side down and grill for 1 minute. Remove buns to serving plate, and place burgers on bottom halves, topping with cheese slices immediately.
Top burgers with sliced avocado and pickled onions, and enjoy!