Creating Chicken & Potato Casserole is a simple and rewarding process. Follow these steps to bring this amazing dish to life:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Prepare Potatoes: Peel and cube the potatoes. Place them in a pot of salted water and bring to a boil. Cook until tender, approximately 10-15 minutes. Drain and set aside.
3. Sauté Onions and Garlic: In a skillet, heat the olive oil over medium heat. Add the chopped onion and minced garlic. Sauté until the onion becomes translucent, about 3-5 minutes.
4. Combine Ingredients: In a large mixing bowl, combine the cooked chicken, drained potatoes, sour cream, half of the cheddar cheese, chicken broth, sautéed onion and garlic, salt, pepper, and paprika. Mix well until everything is evenly coated.
5. Add Vegetables: If using, fold in the frozen mixed vegetables to the mixture.
6. Transfer to Baking Dish: Pour the mixture into a greased 9×13 inch baking dish, spreading it evenly.
7. Top with Cheese: Sprinkle the remaining cheddar cheese over the top of the casserole.
8. Bake: Place the casserole in the preheated oven and bake for 45-60 minutes or until bubbly and golden on top.
9. Cool Slightly: Once done, remove from the oven and allow it to cool for about 10 minutes before serving.

Following these steps will guide you to create a delectable Chicken & Potato Casserole that everyone will love.