On MEDIUM heat, add in your oil, garlic and onions and saute until fragrant and translucent.
Once the garlic and onions are cooked, add in your favourite jar of tomato sauce and switch the heat to MEDIUM-LOW. *Optional: If the sauce is super thick, you can add 1/4 cup of water.* In a seperate bowl, add in your ground meat, cheese and breadcrumbs, italian seasoning, salt and pepper and mix well.
Roll the meat mixture into 3x3" balls and add into tomato sauce.
Let the meatballs and sauce simmer for minimally 30 minutes.
Once the meatballs are thoroughly cooked, turn the heat off and add in your spaghetti pasta to warm up.
Stuff each of the taco shells with spaghetti and meatballs on top.
Serve and enjoy!