Elevate your air fryer hamburgers with the rich and bold flavors of blue cheese and caramelized onions. Start by caramelizing onions in a skillet with butter and a pinch of sugar until they are golden brown and sweet. Cook the hamburger patties in the air fryer until they are juicy and cooked to your liking. Top the burgers with crumbled blue cheese and a generous amount of caramelized onions. Serve them on toasted buns with arugula for a gourmet burger experience that will impress your taste buds.
