Cook lean hamburger and diced onions in large skillet over medium heat until meat is cooked through.
Drain and return to skillet.
Add uncooked noodles, milk, water, garlic powder, cornstarch, paprika, diced tomatoes (drained), salt and pepper.
Stir ingredients together.
Bring to a boil, reduce heat and simmer covered for 10-12 minutes or until noodles are cooked. Stir occasionally.
Add shredded cheddar cheese and mix well.
Cook until cheese is melted.
Serve and enjoy!