In a large pot of boiling salted water, blanch the broccoli florets for 2-3 minutes until bright green and tender-crisp. Drain and set aside.
In the same pot, add the olive oil and sauté the diced chicken over medium heat for about 6-8 minutes or until cooked through. Add minced garlic and sauté for an additional minute until fragrant. Season with salt, pepper, and Italian seasoning.
Stir in the cooked rotini pasta, blanched broccoli, and Alfredo sauce into the pot. Mix well until all components are combined and coated in sauce.
Transfer the entire mixture to a greased 9x13 inch baking dish.
Sprinkle shredded mozzarella cheese and grated Parmesan cheese evenly over the top. If using breadcrumbs, sprinkle them on top for an added crunch.
Bake in the preheated oven for 25-30 minutes, or until the cheese is bubbly and golden.
Remove from the oven and let it cool for a few minutes before serving.
Notes
Serve hot and garnished with fresh chopped parsley or basil for a pop of color and added flavor.