If you meet the age requirement, UK residency status, and amateur-baker title, you need to fill out a seven-page application to be considered.
The show's 2017 winner Sophie Faldo told Radio Times in 2019 that the application is quite long.
"It focuses mostly on your baking," she said of the application. "Every section, like bread and cakes, and biscuits, has its own page and you have to say what your signature bake is and how often you bake it."
If selected after an additional phone interview, applicants then meet show executives in person and are judged on baked goods they make in both on- and off-camera tests.
Faldo added, "You have to bake something while you're there, to make sure you've not just been bringing in someone else's work. It's also to see that we were happy baking and talking at the same time and how we cope with that."