Bring a large pot of salted water to a boil. Add the penne pasta and cook according to package instructions until al dente. Drain and set aside.

In a skillet over medium heat, add the ground beef and cook until browned. Drain excess fat.

Add the chopped onion, garlic, and bell pepper to the skillet. Sauté until the vegetables are softened.

Stir in the crushed tomatoes, tomato paste, oregano, basil, salt, and pepper. Simmer for about 15 minutes.

Add the cooked pasta to the sauce and stir to combine. Cook for an additional 2-3 minutes to heat through.

Serve hot, garnished with grated parmesan cheese and chopped parsley.