01 - Preheat oven to 375°F. 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 directions. Drain and set aside.
03 - While pasta cooks, steam or blanch broccoli florets for 2-3 minutes until bright green and 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 2-3 minutes.
06 - Add cooked pasta to the skillet and toss until all ingredients are evenly coated.
07 - Pour pasta mixture into prepared baking dish. Distribute mozzarella and Parmesan cheese evenly over the surface.
08 - Bake for 20-25 minutes until mixture is bubbly and cheese is golden brown.
09 - Remove from oven and allow to rest for 5 minutes before serving.