In a large pot of salted boiling water, cook the rotini according to package directions until al dente. Drain and set aside.
In a large mixing bowl, combine the softened cream cheese, ranch dressing, olive oil, garlic powder, onion powder, salt, and pepper. Mix until smooth and well combined.
Add the cooked pasta, shredded chicken (if using), mixed vegetables, and 1 cup of shredded cheddar cheese to the ranch mixture. Stir until everything is evenly coated.
Transfer the mixture into a greased 9x13 inch baking dish.
Sprinkle the remaining 1 cup of cheddar cheese and the grated Parmesan cheese evenly over the top.
Bake in the preheated oven for 25-30 minutes, or until the cheese is melted and bubbly, and the edges are golden brown.
Remove from the oven and allow to cool for a few minutes. Garnish with fresh parsley before serving.
Notes
Feel free to add more vegetables or spices to taste.