Cook pasta according to directions, omitting salt and fat. Drain.
Heat a large skillet over medium. Add beef, onion, Worcestershire, and mustard; cook, stirring often, until meat is done, about 5 minutes. Transfer to a bowl; stir in tomatoes.
Whisk together milk and flour. Pour mixture into skillet; bring to a boil over high. Add cheeses; stir until cheeses melt. Remove from heat. Stir in pasta and meat mixture. Top with parsley, salt, and pepper.
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