Preheat oven to 375°. Prepare pasta as directed on package. Combine pasta, chicken, broccoli, Alfredo sauce, half-and-half, ½ cup cheese and 1 Tbsp. Rustic Herb Seasoning in a large bowl. Transfer to greased 2-quart baking dish.
In a small dish, combine bread crumbs, butter, ½ cup cheese and 1 tsp. Rustic Herb Seasoning. Sprinkle over casserole. Bake, uncovered, 25-30 minutes or until bubbly and lightly browned. Salt and pepper to taste. (If it's browning too quickly, cover loosely with foil.)