Preheat oven to 160°c Fan oven or 180°c non fan |350°F| Gas Mark 4.
Grease a square brownie tin and line with baking paper.
Cream the butter and sweetener together until light and fluffy. Next add the cream cheese and combine well.
Gradually add in the eggs and mix until smooth. Add the flour, baking powder , vanilla essence and salt and stir everything together.
Pour the batter into the brownie tin and spread out evenly. Bake in the oven for about 20 -25 minutes until cooked through. Leave to cool in the tin, then remove.
Now mix the cream cheese, cocoa powder, sweetener together to make the icing. Spread evenly over the cake and scatter the walnuts over the top. Garnish with the grated chocolate. Cut into squares.
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Notes
If you use Stevia sweetener reduce the amount to about 2 - 3 tablespoons.Use hazelnuts or peanuts as an alternative to walnuts.