Cook the pasta according to package instructions.
Spray a Dutch oven or large skillet with nonstick spray and heat it over medium heat for about 5 minutes until the pan is hot.
Add the ground beef, chopped pepper, chopped onion, minced garlic and spices and stir the mixture around until the beef is no longer pink.
Add the tomato paste and salsa to the beef mixture, and cook it for about 2 minutes
Remove the mixture from heat and stir in the half and half and cheddar cheese.
Stir in the cooked pasta and green onions. Cook over medium heat until the pasta is heated through.