Cook pasta according to package directions; drain. Rinse with cold water and drain; set aside. Melt 2 Tbsp. butter in a heavy saucepan over low heat; add flour, stirring until smooth. Cook 1 minute, stirring constantly. Gradually add milk; cook over medium heat, stirring constantly, until mixture is thickened and bubbly. Remove from heat; stir in cheese and next 3 ingredients. Combine noodles, cheese sauce, ham and peas; spoon into a lightly greased 1 1/2 quart baking dish. Combine bread crumbs and 1 Tbsp. melted butter; sprinkle over ham mixture. Bake, uncovered, at 350 degrees F for 25 minutes or until bubbly. Sprinkle with chopped parsley, if desired.