Muffy is having difficulty coming up with a recipe for a strawberry-themed contest. Her friends suggest a cookie recipe, which turns out to taste delicious, and she takes all of the credit, much to her friends' anger and disgust. Muffy learns the hard way about taking credit for someone else's work when she tries to bake the cookies herself, but cannot remember the recipe. Sue Ellen feels left out about not having a sibling, so she tries to pretend having her friends as siblings, but they each have their own flaws. During a playdate with D.W., Sue Ellen learns about the dangers of having a younger sibling and gets bullied by D.W. Soon after, Sue Ellen gets a letter from a boy named Tenzin living in Tibet, who becomes her pen pal.