What's Cooking? & Buster's Special Delivery

What's Cooking? Ming Tsai: The big cooking competition is coming up and everyone is making a dish of his or her choice. Arthur decides to make a chocolate cake. Everything goes wrong when the baking powder is gone and baking soda is used instead, but Arthur learns making mistakes in cooking may lead to the creation of a new recipe.
Buster's Special Delivery: Mr. Haney has decided to choose the very first student mail carrier. Buster accepts the job with great enthusiasm. He starts not liking work, but eventually, some assistance teaches him to perform his job better.