Can I use frozen sausages in the air fryer?

Absolutely, Just add 2-3 extra minutes to the cooking time. For best results, I recommend thawing them overnight in the fridge first - frozen sausages can sometimes cook unevenly. If you're really in a pinch, run them under cold water for a few minutes to speed up thawing before patting dry and cooking.

How do I know when the sausages are done?

The golden rule? That meat thermometer reading 160°F (71°C) in the thickest part. No thermometer? Cut one open - no pink should remain, and the juices should run clear. They'll also feel firm when pressed (not squishy) and have that gorgeous browned exterior we all love.

Can I make this recipe without oil?

You sure can. The oil helps with browning, but many sausage varieties have enough fat to crisp up on their own. If skipping oil, I'd recommend patting the sausages extra dry first and maybe cooking at 375°F instead of 400°F to prevent drying out. The texture will be slightly different, but still delicious.