Creating Creamy Turkey Pasta Bake is straightforward with these step-by-step instructions:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Cook Pasta: In a large pot, bring salted water to a boil. Add the penne pasta and cook according to package instructions until al dente. Drain and set aside.
3. Sauté Turkey: In a large skillet, heat olive oil over medium heat. Add the ground turkey and cook until browned, breaking it into small pieces as it cooks.
4. Add Vegetables: Stir in the chopped onion, minced garlic, bell peppers, and mushrooms. Cook for about 5 minutes until the vegetables are tender.
5. Season: Add the spinach, dried Italian seasoning, salt, and black pepper. Cook until the spinach wilts.
6. Make the Sauce: Pour in the heavy cream and stir to combine. Allow the mixture to simmer for a few minutes until slightly thickened.
7. Combine Ingredients: Add the cooked pasta to the turkey and vegetable mixture. Stir in half of the mozzarella cheese and half of the Parmesan cheese, mixing well.
8. Transfer to Baking Dish: Pour the pasta mixture into a greased baking dish, spreading it evenly.
9. Top with Cheese: Sprinkle the remaining mozzarella and Parmesan cheeses over the top.
10. Bake: Place the baking dish in the preheated oven and bake for 25-30 minutes, or until the cheese is bubbly and golden brown.
11. Garnish: Remove from the oven and let it cool for a few minutes. Garnish with fresh parsley before serving.

These steps will guide you to create a delicious Creamy Turkey Pasta Bake that is sure to impress your family and friends.