Prep the produce: Remove husks from the tomatillos, then rinse off the sticky residue and pat dry. Quarter the onion.
Remove stems from the peppers. Peel the garlic.
Preheat the air fryer: Set to 400°F (200°C) for 3 minutes. Preheating promotes better charring.
Load the basket: Add tomatillos, onion, peppers, and garlic to the basket in a single layer.
Lightly spray with oil for deeper browning, if desired.
Air fry: Cook at 400°F for 8–12 minutes, shaking halfway. You’re looking for blistered skins on the tomatillos, lightly charred edges on the onion, and softened peppers. Garlic should be golden, not burnt.
Cool briefly: Let the vegetables rest for 5 minutes to release juices and mellow the heat.
Blend: Add the roasted vegetables to a blender or food processor with cilantro, lime juice, and salt.
Pulse until you reach your preferred texture. For a smoother salsa, blend longer and add 1–2 tablespoons of water.
Taste and adjust: Add more lime for brightness, salt for balance, or a pinch of sugar if it’s too tart. For extra heat, blend in another pepper.
Rest the salsa: Let it sit for 10–15 minutes.
The flavors meld and the color deepens slightly.
Serve: Spoon over tacos, quesadillas, eggs, grilled meats, or serve with tortilla chips.