In a bowl put together chocolate, butter, sugar and 2 tbsp water.
Put in microwave for 2 minutes.
Sift together flour, baking powder and salt. Mix well.
Cool the chocolate mixture, add eggs and beat well.
Now mix the flour mixture and chocolate mixture.
Also add walnuts and vanilla essence. Mix well.
Pour this mixture in greased ovenproof dish.
Bake in a preheated oven of 180°C for 30 minutes.
Remove, cool and cut into squares and serve.
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