Remove sausages from their skins and mash together in a bowl until no longer lumpy.
Unroll the puff pastry and cut in half lengthways so you're left with two long strips
Spread a long line off mustard, just off centre along each of the strips, then top with a line of the sausage meat.
Brush beaten egg along the slightly thinner edge and then fold the pastry over and seal using a fork.
Brush the top of the pastry with beaten egg and cut slashes down it using a sharp knife. Repeat the last few steps for the other strip of pastry and the rest of your sausage meat.
Use a sharp knife to cut the sausage rolls to the size you’d like / what fits in your air fryer basket - I made 4 big ones!
Place in the air fryer at 200C for 12-14 minutes until golden, crisp and cooked through. (If you need to preheat your air fryer then ensure you do - some do, some don’t!)
Remove from the air fryer, allow to rest for 5-10 minutes, then enjoy!