Remove the refrigerated pie crust from the fridge 15 minutes before starting.
Unroll the dough and set the tart pan on top. Cut a circle about 1 inch wider than the pan.
Press the crust into the pan, tucking the edges down the sides. Trim any excess so the crust is level with the rim.
Place the tart pan in the air fryer basket and cook at 300°F (150°C) for 5 minutes.
Sprinkle the cheese over the bottom of the crust, then scatter the bacon over the cheese.
Whisk the egg, cream, salt, pepper, and nutmeg until smooth, then whisk 15 seconds longer to add air.
Pour the custard slowly over the fillings, up to the top edge of the crust. Do not overfill.
Return to the air fryer and cook at 300°F (150°C) for 10 minutes, until the center reaches 165°F and wobbles slightly.
Rest 1–2 minutes, then push the quiche up out of the pan and slide a spatula under to release it.
Serve warm.