Add ground beef, onion and minced garlic to a 5 quart dutch oven over medium-high heat. Cook until beef no longer pink, stirring frequently and breaking up with a spatula or wooden spoon. Drain excess grease using a slotted spoon or paper towels.
Stir in chili powder cumin, paprika, salt, black pepper and cayenne and cook for about a minute.
Stir in beef broth, tomato sauce, canned tomatoes and kidney beans. Bring to a gentle boil then reduce heat to low and simmer uncovered for about 20 minutes. If simmering longer, cover with the lid.
Meanwhile, boil a pot of water and cook the pasta according to package instructions.
Turn off the heat under the chili and stir in macaroni and 1 cup of shredded cheese until melted. Top evenly with remaining cheese and cover the pot with the lid. Let sit, covered, for about 5 minutes or until cheese is melted.
Garnish with thinly sliced green onions and serve immediately.
Notes
Feel free to use your own favorite chili recipe or even canned chili (2 15-ounce cans) in a pinch.