In a medium mixing bowl, combine the ground beef, sea salt, black pepper, garlic powder, and 1 tablespoon of the buffalo sauce.
Gently mix the ingredients by hand until just combined, then form into one large, thick patty.
Heat the avocado oil in a cast-iron skillet or non-stick pan over medium-high heat.
Add the patty to the hot skillet and sear for 4-5 minutes per side, or until it reaches your desired level of doneness.
During the last minute of cooking, sprinkle the blue cheese crumbles over the patty and cover the pan with a lid to allow the cheese to melt.
While the burger rests, lightly toast the whole wheat bun in the same skillet or a toaster.
Place the butter lettuce, tomato slice, and red onion on the bottom bun.
Place the cheesy buffalo patty on top of the vegetables, drizzle with the remaining 1 tablespoon of buffalo sauce, and top with the other half of the bun.