Heat olive oil in large skillet over medium-high heat and add ground beef. Break into chunks with a wooden spoon and cook, stirring often, for about 5 minutes.

Add onion and cook for another 5 minutes or until beef is cooked through and onion is softened.

Add broth, water, ketchup, tomato paste, garlic powder, and salt and pepper, and stir to combine. Add macaroni and bring to a boil then reduce to simmer and cook for about 10 minutes or until macaroni is al dente and liquid has reduced.

Meanwhile, melt butter in another pan over medium-high heat. Add flour and whisk for 1-2 minutes or until flour is cooked through. Add milk and whisk until smooth. Cook until sauce begins to thicken, about 4-5 minutes. Remove from heat and add cheese. Stir until cheese is melted and sauce is smooth.

Add cheese sauce to hamburger and noodle mixture and stir to combine. Garnish with fresh parsley and serve.