Preheat the oven to 400 degrees F. Coat a 9"x13" pan with cooking spray.

Bring a large pot of salted water to a boil, and cook the penne pasta according to package directions.

Heat the olive oil in a pan over medium high heat. Add the onion and garlic cook for 3-4 minutes or until softened.

Add the chicken, Italian seasoning, salt and pepper to the pan. Cook for 4-6 minutes, stirring occasionally, or until chicken is cooked through.

Pour the marinara sauce and chopped basil or parsley into the pan and stir to combine.

Drain the pasta and add it to the 9"x13" dish. Pour the chicken and sauce mixture over the pasta and stir to combine.

Bake for 10-15 minutes or until cheese is melted, then serve.