Julie, a young writer in New York, feels frustrated with her job and uninspired by her life. In search of a creative outlet, she decides to cook her way through Julia Child's famous cookbook, "Mastering the Art of French Cooking," and starts a blog to document her journey. Despite initial skepticism from those around her, Julie finds purpose and joy as she tackles the challenges in the kitchen, while also navigating the ups and downs of her marriage. As her blog gains followers, Julie learns lessons about resilience, ambition, and passion.

In parallel, the film depicts the life of Julia Child, starting with her time in Paris in the 1950s. Julia is initially a bored housewife, but she discovers her love for French cuisine and decides to attend the renowned Le Cordon Bleu cooking school. Her dedication and enthusiasm lead her to co-author the revolutionary cookbook that would eventually change American perspectives on cooking. Julia's story is one of persistence and breaking barriers, showcasing her vibrant personality and her supportive relationship with her husband. The narratives of both women intertwine, highlighting their parallel struggles and triumphs in their individual quests for self-fulfillment.