When Trader Joe's introduced Lemon Flavored Mini Sheet Cakes last June, they quickly became a fan favorite. Shoppers snatched them up almost instantly, and the limited-edition treat sold out fast. If ...

Spoon the mixture into the tin and bake for about 1½-2 hours, or until a skewer inserted comes out clean. Leave to cool in the tin, then carefully remove from the tin. For the 25cm/10in cake ...