Bite-Sized Magic (Bliss Bakery Trilogy, 3)

This third book in Kathryn Littlewood's acclaimed Bliss trilogy mixes the down-home heart punch of Ingrid Law's Newbery Honor Book Savvy, the always-on-the-edge-of-chaos comedy of Cheaper by the Dozen, and a humorous magic all its own to create a thoroughly original confection, a delicious guilty pleasure for readers of all ages.
Rose won back her family's magical Cookery Booke in an international baking competition in A Dash of Magic, the second novel in the series. Rose is now world famous—so famous, in fact, that Mr. Butter, head of the Mostess Corporation, has kidnapped her so that she can develop new and improved magical recipes for his company's snack cakes. With the magically enhanced Dinkies and Moony Pies, Mr. Butter plans to take over the world.
Together with her brothers, their talking cat and mouse, and an unlikely team of bakers, Rose must overthrow Mr. Butter before he destroys civilization, one magically evil snack cake at a time.