01 - Preheat oven to 375°F and grease a 9x13-inch baking dish with butter or cooking spray.
02 - Bring a large pot of salted water to a boil. Cook pasta until al dente according to package instructions, then drain and set aside.
03 - While pasta cooks, steam or blanch broccoli florets for 2 to 3 minutes until bright green and just tender. Drain and set aside.
04 - In a large skillet over medium heat, melt butter. Add minced garlic and sauté until fragrant, approximately 1 minute.
05 - Stir in cooked chicken, steamed broccoli, Alfredo sauce, and milk. Season with salt, pepper, and Italian herbs. Heat until warmed through, about 2 to 3 minutes.
06 - Add cooked pasta to the skillet and toss until all components are evenly coated.
07 - Pour the mixture into the prepared baking dish. Distribute mozzarella and Parmesan cheese evenly over the surface.
08 - Bake for 20 to 25 minutes until the mixture is bubbly and cheese reaches a golden brown color.
09 - Remove from oven and allow the bake to rest for 5 minutes before portioning and serving.