01 - Bring a large pot of salted water to a boil. Add elbow macaroni and cook until just al dente. Drain in a colander and set aside.
02 - In a large skillet or Dutch oven over medium-high heat, cook ground beef until thoroughly browned. Drain off any excess fat.
03 - Add diced onion, minced garlic, and diced red bell pepper to the browned beef. Sauté for 4 to 5 minutes until vegetables are softened and fragrant.
04 - Stir in chili powder, ground cumin, smoked paprika, dried oregano, salt, and black pepper. Cook for 1 minute, stirring constantly, until the spices are fragrant and evenly coating the meat mixture.
05 - Pour in the diced tomatoes with their juices, tomato paste, and kidney beans. Stir to combine. Bring to a simmer and cook for 8 to 10 minutes, stirring occasionally, until flavors meld and the mixture slightly thickens.
06 - Reduce heat to low. Add the cooked macaroni, milk, and shredded cheddar cheese to the skillet. Stir thoroughly until the cheese is completely melted and all components are evenly incorporated.
07 - Taste and adjust salt and pepper as needed. Serve immediately while hot, garnished with fresh cilantro, sliced green onions, or additional shredded cheese if desired.