You'll need..
1/2 cup unsalted butter
1/4th cup coco powder
1 cup sugar
1/2 cup all-purpose flour (maida)
1/2 tsp baking powder
1/4 teaspoon salt
2 large eggs
1 teaspoon vanilla extract
1/2 cup chopped walnuts
Method
Melt butter in a pan on a low flame and cool. Add the sugar and stir well to combine.
Sift the flour, salt, baking powder and coco powder. and add it to the butter mixture. Mix them well.
Add the eggs, keep mixing until smooth.
Add the vanilla and mix well. Stir in the chopped nuts.
Put the mixture into the microwave safe 8" square bowl and microwave on high for 4-5 minutes.
(The strength of each microwave differs, so first microwave for 3 1/2 minutes and check once with a tooth pick before you continue for another minute.)
Wait for it to cool for about 15-20 minutes. cut into cubes. Enjoy!!