Nadiya's all-American traybake is made with peanut butter and jam. Serve with an extra dollop of jam, some Greek-style yoghurt and fresh raspberries on the side. You will need a brownie tin about ...

Butter and flour two 9-inch round cake pans (or use nonstick baking spray ... and mix until they are well blended. Mix in the jam. At this point it will look like blackberry soup.

until you have three layers of cake on top of each other (each sandwiched with buttercream and jam) and a cavity in the centre. Fill the cavity with jelly beans and place the final layer of cake ...