Indulge in the rich and bold flavors of blue cheese and caramelized onions with this air fryer hamburger recipe. Start by caramelizing onions in a skillet with butter and a pinch of sugar until they are golden brown and sweet. Season your ground beef patties with salt and pepper, then cook them in the air fryer until they are cooked through. Top each patty with crumbled blue cheese and a generous amount of caramelized onions. Serve the burgers on toasted buns with lettuce and tomato for a gourmet burger experience!
