Brown Beef: First, cook ground beef until you get a brownish tone in a skillet. Add onions and garlic; cook until softened. Drain excess grease.
Load Crockpot: Transfer beef mixture to crockpot. Add taco seasoning, bell pepper, tomatoes, and broth. Stir to combine.
Slow Cook: LOW cook for 4–5 hours & HIGH cook for 2–3 hours.
Add Pasta: Break spaghetti into thirds; stir into crockpot 30–40 minutes before serving. Ensure pasta is submerged.
Cheesy Finish: Once pasta is tender, stir in cheese until melted.
Serve: Garnish with cilantro or parsley and enjoy.