Chicken cordon bleu casserole

1 cup Reduced Fat Sour Cream
1 1/2 cups Reduced Sodium Chicken Broth
1 Tbsp Digon mustard
1/4th tsp ground black pepper
1 1/2 cups instant rice, uncooked
1 pkg (20oz) fully cooked frozen diced grilled chicken breasts.,thawed
8 0z pkg diced ham
1 pkg sliced aged swiss cheese, cut into pieces
1 cup frozen peas or mixed vegetables (optional)
1 medium onion, chopped
1 cup corn flakes
1/2 cup grated parmesan cheese
2 tbs butter

Directions:
Preheat oven to 400 degrees
Whisk togither sour cream, chicken broth, dijon mustard and black pepper until smooth.
Add rice, chicken, ham, swiss cheese,  frozen peas or veggies, and onion.  Stir to combine.
Pour mixture into a 13 x 9 in baking dish and spread evenly.
Mix together crushed corn flakes, Parmesan cheese, and melted butter in a small bowl.  Sprinkle evenly over top of the casserole
Bake uncovered on center oven rack for 25minutes until heated through and topping is golden brown.