Preheat oven to 400°F (200°C) and grease a 9x13-inch baking dish.
Add cooked pasta, sliced kielbasa, and chopped broccoli directly into the baking dish.
Add the mozzarella, Colby Jack, Alfredo sauce, and the entire packet of ranch seasoning.
Stir everything together right in the dish until evenly coated. Top with an extra sprinkle of cheese if desired.
Cover tightly with aluminum foil and bake for 30 minutes.
Remove foil and broil for 2-3 minutes until bubbly and lightly browned. Garnish with parsley and serve hot with garlic breadsticks and salad.