Preheat air fryer to 350°F (175°C) for 3–5 minutes (optional).
Line basket with a small piece of foil or use a nonstick basket liner (optional).
Place bacon strips in a single layer without overlapping.
Cook at 350°F (175°C) for 8–12 minutes, flipping halfway if needed.
For thicker cuts, cook 12–15 minutes; for thinner cuts, cook 7–10 minutes.
Remove bacon when crisped to your preference.
Transfer to a paper towel–lined plate to drain.
Let rest 1–2 minutes before serving.