Heat a little olive oil in a large skillet with a tight-fitting lid over medium heat.
Add ground beef, onion and garlic and cook until beef is no longer pink and onion is translucent, about 10 minutes. Drain off any fat.
Add next 6 ingredients (macaroni through crushed red pepper flakes). Blend well. Bring mixture to a boil then reduce heat, cover skillet and simmer for 20 minutes, stirring occasionally, until macaroni is tender.
Uncover and cook over medium heat, stirring frequently, until mixture has thickened. Serve topped with shredded cheese, sliced green onions, and enjoy!!!