Put a pan of water on to boil. Cut the bacon into 1 cm pieces whilst waiting for the water to reach boiling point. Add the pasta, along with a few shakes of salt, to the boiling water, and cook according to packet instructions.
Whilst the pasta is cooking, fry the bacon pieces until crispy.
Prepare the sauce whilst the bacon and pasta are cooking. Add the grated cheese, egg, double cream and seasoning to a small bowl. Mix until combined.
Once the pasta is cooked, drain it and return it to the pan. Add the cheesy sauce and stir - it will cook as it mixes with the pasta. Stir in the bacon pieces, then serve in warm bowls.