spaghetti carbonara

tried out spaghetti carbonara from Donna Hay's book...tip for this recipe, it needs to be served warm immediately...i added some mushroom to add some kick to it..

500g spaghetti
300g beef/chicken bacon strips
5 fresh button msuhroom, sliced
3 small onions, sliced
4 egg yolk
1/2 cup cream
1/2 cup grated parmesan
2 tbsp chopped parsley
extra grated parmesan cheese to serve

• cook the pasta in a large saucepan of salted boiling water for 10 min or until al dante. drain and keep hot
• while the pasta is cooking, heat a non stick frying pan over medium heat. cook the bacon, mushroom and onions for 3-4 min.
• whisk the egg yolk with cream and parmesan in a bowl and toss through the hot pasta, coating well. 
• stir in the bacon and parsley and top with extra parmesan