Sieve flour along with baking powder keep aside

In a double boiler melt chocolate with butter mix sugar

Add vanilla extract

Add dry ingredients into wet ingredients

Mix milk make a smooth batter

Line a square shape cake tin with butter paper

Grease with butter

Mix chopped walnuts into batter

Pour into cake tin

Place in preheated oven

For 30 mints temperature should be 180 degrees

Remove from oven cool down

Cut into squares and enjoy