Bring water to a boil & cook the pasta (abut 8 min for fusilli). Drain the pasta & set aside.
In the meantime: Grate the Parmesan & set aside.
Melt the butter in the frying pan, add the vegetables & fry softly. Nothing shall get burnt!
Whip the eggs thoroughly with an egg whip & add some of the finely grated Parmesan (about ⅓). Set aside.
Add the fusilli to the frying pan and mix ...
Add the egg mix, make sure that the egg mix covers all the vegetables and the pasta. Scatter the grated Parmesan all over the top.
Let it cook softly in the frying pan & close with a lid when it's setting. Cook softly for about 10 min until all is firm and the Parmesan has melted.
Try to get it onto a plate w/o breaking it apart. Cut into pieces.