Cheesy Ranch Chicken Casserole with Tater Tots Recipe | This Cheesy Ranch Chicken Casserole with Tater Tots is made with diced rotisserie chicken, corn, broccoli, and onion in a creamy cheesy ranch sauce topped with cheddar cheese and tater tots. It's a complete meal that can be prepared with 20 minutes of active preparation time and 30 minutes of cook time.