A series of increasingly far-fetched events might occur if someone were to give a cupcake to a cat.

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.

When Blakely Elementary's new art teacher, Mr. Dubois, becomes the advisor for Peace, Love, and Cupcakes, his zany ideas irk club founder Kylie, but orders are pouring in so quickly that there is no time to argue, and Lexi is busy competing against school bully Meredith in a pageant.

When Katie's best friend Callie leaves her for a clique called the Popular Girls Club on the first day of middle school, Katie decides to find a group that she can join.

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.

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.

Aspiring to win the science fair with a project that proves that cupcakes are good for you, Alexis finds her ambitions challenged by her crush's association with another girl and a cupcake order for a mean girl's sweet sixteen.

"Libby hosts a puppy party for her friends and their dogs. With the help of her friend Rosa and little brother, Libby decorates, stuffs goody bags and bakes delicious cupcakes. But when they realize they've forgotten an important ingredient, they use science to solve the problem just in the nick of time"--

Mia asks the girls in the Cupcake Club to be junior bridesmaids in her mother's wedding.

Feeling like a third wheel in the Cupcake Club when best friend Emma goes away on a family trip, Alexis bonds with Katie while Mia spends time with a visitor, a situation that helps all the girls to discover the benefits of sharing friendships with multiple people.