1 1.8-ounce package white sauce mix*2 cups milk1/2 cup grated Parmesan cheese (2 ounces)1/2 cup American cheese (2 ounces), cubed1/8 teaspoon ground pepper1 7-ounce package macaroni, cooked according to package directions, drained1 1/2 cups cubed full-cooked ham (use leftover ham if available)1 cup frozen green peas, thawed (optional)Notes: *If you want to make a white sauce from scratch, melt 3 tablespoons butter in a sauce pan. Stir in 1/4 cup flour and cook until mixture bubbles. Stir in 2...