Step 1

Preheat oven to 195°C/175°C fan-forced. Grease a 3cm-deep, 20cm x 30cm (base) lamington pan. Line with baking paper.

Step 2

Place sugar, flour, walnuts, cocoa powder, oil, eggs and vanilla in a large bowl. Stir to combine. Pour into prepared pan. Bake for 30 minutes or until a skewer inserted in the centre comes out with moist crumbs clinging. Cool in pan. Cut into 12 pieces. Serve dusted with cocoa.