Sift the flour into the bowl and gently fold in along with the
chopped walnuts, vanilla essence and the remaining chocolate
chips. Be careful not to overmix.
Spread the mixture out in the prepared tin and bake for about 30
minutes, or until risen and golden brown. The centre should be
firm to the touch but will be slightly soft until it cools down.
Leave to cool in the tin, then cut into twelve bars when the brownie
is completely cool.
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