The highly determined Starla Jean is back, and she is entirely focused on executing the most important mission of the year: throwing the ultimate first birthday party for her baby sister, Willa. Starla has a comprehensive checklist to guarantee success. She needs to string up beautiful decorations, keep her beloved pet chicken Opal Egg out of trouble, and gather all the necessary ingredients to bake a spectacular cake. She also desperately hopes Opal Egg will finally lay a real egg in time for the celebration. With invitations sent and the new neighbor Nate's mischievous kitten thrown into the mix, the stage is set for a wild afternoon. Naturally, nothing goes exactly according to Starla's meticulous plan. In true Starla Jean fashion, a series of hilarious and unexpected surprises threatens to completely derail the festivities. Between wrangling farm animals in the house and attempting to bake a masterpiece, Starla must learn to go with the flow and discover that sometimes the most chaotic surprises make for the absolute best birthday memories.