Line a shallow baking tray, measuring about 30x20cm, with aluminum foil.
Grease the foil and dust it with flour. Keep ready.
Preheat the oven. Bake for about 20 minutes in medium hot oven.
Cool slightly and then cut into squares.
Remove the Brownies from the tray when completely cooled off.
Decorate each piece with half a walnut or sprinkle with some chocolate powder.
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