In a large pot of boiling salted water, cook pasta according to package instructions; drain well.

Heat a nonstick pan over medium heat, cook the ground beef until browned, about 3-5 minutes, making sure to crumble the beef as it cooks.

Add onion to the pan, and cook, stirring frequently, until translucent, about 2-3 minutes. Stir in garlic and Italian seasoning until fragrant, about 1 minute.

Whisk in flour and cook about 1 minute.

Gradually whisk in beef broth and crushed tomato. Bring to a boil; reduce heat and simmer, stirring occasionally, until reduced and slightly thickened, about 6-8 minutes.