Chicken casserole is a traditional Chinese roasted chicken dish, which is usually served with some side dishes to add flavor and nutritional value. Here are some common side dishes for chicken casserole:

1. Onion: Onion is a tasty and nutritious vegetable that can add texture and flavor to chicken casserole. Cutting onions into small pieces and baking them together with chicken casserole will make the dish more delicious.

2. Potato: Potato is a nutritious and flavorful ingredient that can increase the nutritional value and taste of chicken casserole. Cut the potatoes into small pieces and bake them together with the chicken casserole, which will make the dish more delicious.

3. Carrot: Carrot is a nutritious and tasty vegetable that can increase the taste and texture of chicken casserole. Cutting carrots into small pieces and roasting them with chicken casserole will make the dish more delicious.

4. Green peppers: Green peppers are a tasty and nutritious vegetable that can add texture and flavor to chicken casserole. Cut green peppers into small pieces and roast them together with chicken casserole will make the dish more delicious.

5. Tofu: Tofu is a nutritious and flavorful ingredient that can increase the nutritional value and taste of chicken casserole. Cut the tofu into small pieces and bake it together with the chicken casserole, which will make the dish more delicious.

To summarize, side dishes for chicken casserole can be chosen according to personal taste and preference, and the side dishes listed above are just some common choices.