1. Cook onion in hot olive oil in a large (3-inch-deep) skillet or Dutch oven over medium heat, stirring occasionally, 5 minutes. Add prosciutto and peas, and cook, stirring occasionally, 3 minutes. Stir in wine, and cook 3 to 4 minutes or until mixture is reduced by half. Stir in half-and-half and cream. Season with salt and pepper to taste. Cook 1 to 2 minutes or until slightly thickened.
2. Cook pasta according to package directions; drain. Toss hot cooked pasta with cream mixture. Stir in cheese.