I got this recipe from the May 2011 issue of Rachel Ray Everday. I twiked it a little with the onion and chicken stock instead of Shallot and white wine. Also instaed of making my own pesto I bought my favorite pesto to use. My husband and kids love this.
Bring a pot of water to boil , salt and add the pasta. Cook until al dente drain and set off to the side.
Melt Butter in a large skillet over medium heat, add the onion and stir for a couple of minutes. Add the prosciutto and stir for a minute more, then add the peasand stir to heat through. Stir in chicken stock and cook to reduce, 2 or 3 minutes. Stir in the cream and season with salt and pepper to taste. Lower the heat; let bubble and thicken for a few minutes.
Add the pasta with the cream sauce and the pesto
Put in bowl toss and serve. Extra cheese to taste.