De-flame the onion. Dice your onion, then submerge it in cold water for 10-20 minutes. Afterward, drain the water. Deflaming removes the strong taste of the onion.
Sauté the beef. Lightly grease a pan with oil, and place the pan over medium-high heat. Wait for the pan to heat up, then place the ground beef. Saute for 6-8 minutes or until you see some browning for extra flavor. Once it's fully cooked, take it from the heat, and set it aside.
Preheat your air fryer to 400ºF (204ºC) for 5 minutes.
Assemble the egg roll. While preheating, wrap the big mac egg rolls. 1.) On a clean surface, lay an egg roll wrapper flat (diamond-shaped); 2.) Then, place cheese on top; 3.) Add about 3 tbsps of cooked beef, 1 tbsp onion, and 1 tbsp relish on top of the cheese; 4.) Wet the corners of the wrapper with water to ensure that they stick when you roll them; 5.) Now, fold the bottom half and the sides toward the center (tightly); 6.) Finally, roll the Big Mac Egg Rolls. Repeat until you’ve used up all the ingredients.
(Optional) Brush the egg rolls with cooking oil.
Air fry the Big Mac egg rolls for 8 - 10 minutes or until golden brown at 400ºF (204ºC). Space them out evenly.
While air frying the Big Mac egg rolls, prepare the sauce. Mix the following ingredients: mayonnaise, ketchup, yellow mustard, onion powder, grated garlic, white vinegar, and salt and pepper to taste.
Serve with a side of fries and enjoy!