Cook pasta according package directions, drain, and set aside.
Heat olive oil over medium heat in a large skillet. Add diced onion and sauté over medium heat for 3-5 minutes, or until they start brown. Add Italian Seasoning, crumbled meat, and puréed tomatoes.
Bring mixture to a boil, reduce to a simmer, cover, and cook for 20 minutes.
Add cooked pasta to skillet and stir to combine.