Preheat the air fryer: Set it to 350°F (175°C) for 2–3 minutes.
Preheating helps the muffin toast and the egg set evenly.
Prep the muffin: Split the English muffin. Lightly butter the cut sides or spritz with oil for a golden, crisp surface.
Toast the muffin: Place both halves cut side up in the basket. Air fry at 350°F for 3–4 minutes until lightly golden.
Remove and set aside.
Cook the egg: Lightly spray a small ramekin or silicone mold. Crack in the egg, pierce the yolk gently with a toothpick (helps prevent popping), and season with salt and pepper. Air fry at 350°F for 5–6 minutes for a set yolk, or 4–5 minutes for slightly runny.
Add cheese: Place the cheese on the bottom muffin half.
Top with the cooked egg. If you’re adding bacon, sausage, or greens, layer them here.
Melt and finish: Close the sandwich and return it to the air fryer for 1–2 minutes at 320–330°F to melt the cheese and warm everything through without overcooking the egg.
Serve: Let it sit for 1 minute to settle. Add a dash of hot sauce or a thin spread of mayo if you like.
Eat warm.