Chicken Casserole. Serves 4. This seasoning mix with herbs quickly creates a great tasting chicken casserole that will satisfy the whole family! Shopping list: 1 sachet Colman's Chicken CasseroleSeasoning Mix. 1 tbsp vegetable oil. 4 skinless chicken portions. 2 medium onions, sliced. 3 carrots, sliced. 425ml cold water.