Inflatables in Snack to the Future (the Inflatables #5)

Lynn's birthday is met with reluctance as she despises celebrations, prompting Donut to bake an extraordinary cake to lift her spirits. However, a mishap with his secret recipe catapults the inflata-gang into a time-traveling adventure filled with formidable challenges. The story unfolds as Donut strives to navigate these obstacles and return his friends home while transforming Lynn's outlook on birthdays from negative to celebratory.