For the very first time, it's Batter week! Mary and Paul have set three challenges to test the bakers on some store cupboard classics. To start things off, there is a British favorite. It may sound simple, but the judges are looking for perfection: a uniform bake across the batch, and topped with a tasty savory filling. The bakers really have to rise to the occasion in this signature challenge. Mary sets a classic technical challenge that requires a perfect pastry, a sweet filling, and delicate icing. With only a basic recipe, Mary's only advice to the bakers is to keep their cool. And finally for the showstopper, the ovens are off and the fryers are out, as the bakers are challenged to do their version of a Spanish classic.