Preheat your oven to 375°F. Now, let’s prepare our baking dish! Grease a 9×13 inch baking dish lightly with cooking spray or butter. In a large mixing bowl, combine the cooked rotini pasta, the deliciously tender chicken, both jars of rich Alfredo sauce, and the garlic parmesan sauce. Do not forget to mix in half of the mozzarella cheese and half of the Parmesan cheese into this mouthwatering mixture. Season generously with salt and pepper to taste. Ah, the aroma of seasoning fills the air!

Next, we must stir this delightful mixture well. If you find that it needs a touch more creaminess, add about 1/2 cup of the reserved pasta water. This little trick ensures your bake has that lovely saucy texture. Carefully transfer this hearty mixture into the prepared baking dish, making sure it spreads evenly. Now, let’s top it off by sprinkling the remaining mozzarella and Parmesan cheese over everything, creating that gooey, golden crust we all love!

Cover the baking dish with aluminum foil and slide it into your preheated oven. Bake for about 20-25 minutes, until the cheese has melted and is bubbly. For that perfect touch, you can broil it for an extra 2-3 minutes to achieve a lovely golden top—just don’t forget to keep an eye on it to avoid an unwanted char! Once done, let it cool for around 5 minutes, and then garnish with a sprinkle of fresh chopped parsley, if you like. Serve warm and watch the smiles spread around your table!