Aven Green: Baking Machine by Dusti Bowling

From Sterling Children's Books:

Third-grader Aven Green has been baking for a really long time . . . since last week! 

Now Aven is ready to shake things up by entering the exciting world of competitive baking with her friends Kayla, Sujata, and Emily. Aven knows she’s an expert baker. So what if she doesn’t have arms? That’s just the way she was born. And honestly, she’s a whiz at mixing and measuring with her feet. The one skill Aven hasn’t mastered in the kitchen: working together with her friends. Before long they are fighting over whose dessert is the best. Will adding friends to the mix turn into a recipe for disaster for Aven?