Mary Berry Blueberry Traybake is a single-layer sponge cake baked in a rectangular tin rather than a round cake tin. Fresh or frozen blueberries are folded into the batter, giving bursts of fruit throughout the sponge. Unlike layered cakes, traybakes focus on simplicity, even baking, and easy portioning.
Unsalted butter – 225 g, softened
Caster sugar – 225 g
Eggs – 4 large
Self-raising flour – 225 g
Milk – 2 tablespoons
Blueberries – 200 g
Vanilla extract – 1 teaspoon
Icing sugar – for dusting (optional)
Prepare the oven and tin – Preheat to 180°C (160°C fan) and line the traybake tin.
Cream butter and sugar – Beat until pale and fluffy to build structure.
Add eggs gradually – Mix in one at a time, beating well after each.
Fold in flour – Gently fold to keep the batter light.
Add milk and vanilla – Loosen the mixture to a smooth consistency.
Fold in blueberries – Add gently to avoid crushing the fruit.
Transfer to tin – Spread evenly and smooth the surface.
Bake until set – Bake for 35–40 minutes until golden and springy.
Find it online: https://maryberrycooks.co.uk/mary-berry-blueberry-traybake/