Step 1: Brown the Beef (Optional but Recommended) : In a skillet over medium heat, cook the ground beef with diced onion, bell pepper, and garlic until beef is browned. Drain excess fat. Transfer beef mixture to the slow cooker.
Step 2: Add Chili Ingredients : Add diced tomatoes, tomato sauce, drained beans, beef broth, chili powder, cumin, smoked paprika, cayenne pepper, salt, and pepper. Stir to combine.
Step 3: Slow Cook : Cover and cook on LOW for 4–5 hours or HIGH for 2–3 hours, until flavors meld and vegetables are tender.
Step 4: Cook Pasta Separately : Cook macaroni until just al dente. Drain and set aside.
Step 5: Add Cheese : Stir cream cheese, sour cream, cheddar, and mozzarella into the slow cooker. Add cooked pasta and mix thoroughly until pasta is coated with creamy, cheesy chili sauce.
Step 6: Adjust and Serve : Taste and adjust seasonings. Serve warm with optional toppings like sour cream, green onions, jalapeños, or crushed tortilla chips.