01 - Heat olive oil in a large pot or Dutch oven over medium heat. Add the ground beef and cook until browned, breaking it apart with a spoon, about 5 minutes. Drain excess fat if needed.
02 - Add the diced onion, minced garlic, and diced bell pepper to the pot. Sauté for 3 to 4 minutes until the vegetables are softened.
03 - Stir in the chili powder, ground cumin, smoked paprika, salt, black pepper, and cayenne pepper. Cook for 1 minute until fragrant.
04 - Add the tomato paste and cook for 1 minute, stirring constantly. Stir in the diced tomatoes and drained kidney beans until evenly combined.
05 - Pour in the broth and bring the mixture to a simmer, allowing the flavors to meld together.
06 - Stir in the uncooked elbow macaroni. Reduce heat to low, cover the pot, and cook for 10 to 12 minutes, stirring occasionally, until the pasta is tender.
07 - Remove from heat. Stir in the butter and milk, then add the shredded cheddar cheese. Mix until the cheese is completely melted and the sauce is smooth. Adjust seasoning to taste.
08 - Serve hot, garnished with extra shredded cheese or chopped green onions if desired.