Cook noodles according to package directions. Meanwhile, in a large skillet, melt butter over medium heat. Gradually whisk in cream. Bring to a boil, stirring constantly; cook and stir until thickened, about 2 minutes longer.

Add the ham, cheese, onions, salt and pepper; cook, uncovered, until heated through. Drain noodles; add to ham mixture. Toss to coat; heat through.