In a large dutch oven over medium heat, cook ground beef, onions, and garlic seasoned with salt and pepper, until no longer pink and the onions are tender.
Drain the grease from the beef on a paper towel lined plate.
Return the beef and onions to the dutch oven and add beef broth, tomato paste, Worcestershire sauce, and mustard powder.
Bring the dutch oven to a simmer and add the fusilli noodles.
Cover and simmer for about 9 minutes. Remove cover and stir halfway through.
Add sour cream and milk. Stir to combine all ingredients.
Remove the dutch oven from the heat and stir in the cheddar cheese about a half cup at a time.
Serve immediately.
This cheeseburger pasta can be refrigerated for up to 5 days.