Preheat the oven to 400 degrees Fahrenheit and spray a 9x13 inch pan with cooking spray.

Combine penne pasta, diced onion, cooked diced chicken, undrained diced tomatoes, tomato sauce, chicken broth, sliced mushrooms, diced bell pepper, dried oregano, dried basil, salt, pepper, and minced garlic in the prepared pan.

Stir all ingredients thoroughly to combine.

Cover the pan tightly with aluminum foil that has been sprayed with cooking spray on the underside to prevent sticking.

Bake in the preheated oven for 30 minutes.

Remove from the oven and stir the pasta mixture.

Sprinkle Parmesan cheese evenly over the pasta.

Replace the foil cover and bake for an additional 30 minutes, or until the pasta is cooked through and the cheese is melted and bubbly.

Remove from oven and let cool slightly before serving.

Enjoy!