Four-year-old Babymouse wants to replace the cookies her mom prepared for Santa with a special batch of her own pink-frosted cupcakes. But when her mother goes to check on baby brother, Babymouse hears a roar from the other room and must do what she can to defend the cupcakes from her fiery foe. Will there be any cupcakes left for Santa?

"Who's afraid of middle school? Not Katie Brown. After all, it can't be that different from elementary school. But, boy, was she ever wrong! After her best friend ditches her for a new group of friends called the Popular Girls Club, Katie is left alone and starts to wonder if there's an Unpopular Girls Club she can join. Luckily, Katie finds her way with a great new group of friends and together they form their own club. Four friends plus cupcakes...

Moving on with her Cupcake Club friends despite lingering resentment over being ditched by her former best friend for a more popular group, Katie resolves to confront Callie and struggles to find ways to repair the friendship.

Louise learns about a bake sale and decides to make cupcakes with her brother. But their experiments with the colored frosting goes poorly, and Louise must find a way to create artwork out of the disastrous cupcakes.

Fifth-grader Sadie and her friends in the cupcake club face their toughest challenge yet when they compete in the televised Battle of the Bakers.

"When Mia reads about a Design-a-Dress contest in a magazine for "budding designers ages 12-16" she is excited. But she doesn't realize how much work designing--and sewing--a dress truly is until she starts on her contest entry. While Mia stresses out about all the work she has to do, she and Katie have an argument about, of all things, fashion preferences! Katie offers suggestions that don't really go with the outfit Mia has in mind. And when Mia...

Blossom Valley is opening a brand-new community center, and Layla and her Bots are playing at the opening, but the mayor is worried because not many people have signed up to come to the party; so Layla and her bots decide to build a cupcake machine to attract a crowd--but they are uncertain how to manage the variety of decorations proposed. Includes a DIY activity that readers can try at home.

In exchange for tickets on a Caribbean cruise ship, Jenna and her friends in the cupcake club must bake 12,000 cupcakes for a pirate-themed event.

Emma's younger brother Jake has tonsillitis and makes life difficult for Emma, while the Cupcake Club girls are spoiling him with cupcakes and little gifts.

In the midst of the excitement of Jenna's mom's wedding in Las Vegas, for which the girls of Peace, Love, and Cupcakes are making a giant wedding cupcake tower, Jenna begins to worry about changes the marriage may bring.