There's no need to thaw the green peas. They will have plenty of time to cook in the sauce as it simmers.
Cook pasta according to package directions, omitting salt and fat. Drain.
While pasta cooks, melt butter in a large nonstick skillet over medium heat. Add garlic; cook 1 minute, stirring constantly. Add peas, half-and-half, cheese, and pepper. Bring to a simmer. Cook 3 minutes, stirring frequently (do not boil). Stir in pasta and ham.
This recipe is easy & comes together very quickly. Plan ahead if you want fresh bread from the oven. This entree should be served immediately.