Step 1

Preheat oven to 180ºC. Grease a 16cm x 26cm slice pan and line the base and sides with baking paper.

Step 2

Melt butter, cocoa, dark chocolate and 100g Ferrero Rocher in a heatproof bowl set over a pan of simmering water (don’t let the bowl touch the water). Set aside to cool.

Step 3

Whisk oil, Frangelico, eggs, egg yolk, sugar and vanilla in a bowl. Sift flour and baking powder in a separate bowl. Fold melted chocolate mixture and egg mixture into the dry ingredients. Pour brownie batter into the prepared pan and sprinkle with remaining 50g chopped Ferrero Rocher.

Step 4

Bake for 12 minutes or until slightly risen and just soft in the centre.

Step 5

Allow to cool slightly, then slice into 12 pieces. Drizzle with warm dulce de leche to serve.