Special episode featuring baking-related reports. Andi Oliver goes behind the scenes at Maryland Cookies, to find out how chocolate chips keep their shape. Briony May Williams heads to Germany to get to the bottom of a pretzel mystery, and also learns the surprising truth behind where bicarbonate of soda comes from, while Jimmy Doherty learns about the explosive properties of flour.

Matt Tebbutt visits the Shreddies factory to uncover how cereals keep their crunch. Kate Quilton finds out why some egg yolks are more yellow than others, and if it is really worth paying extra for them. Briony May Williams goes in search of the ultimate bacon butty, and Amanda Byram visits the largest dairy company in the UK to get the lowdown on the shelf life of milk.