In a large pot set over medium hight heat, add the onion and beef. Season with salt and pepper. Cook until brown all over, breaking up the meat as you go, about 10 minutes. Stir in the chili powder, paprika, and garlic powder, cook another minute.Add the pasta and zucchini and toss to coat, then pour in the broth and milk. Add the ketchup and stir to combine. Season with salt. Bring to a gentle boil over medium high heat. Simmer 5-8 minutes until the pasta is al dente, stirring often. Stir in the cheese and cook another few minutes until very creamy. Divide the pasta among bowls and top with fresh parsley. Enjoy!