Take microwave safe bowl, add butter and chocolate chips.
Microwave butter and chocolate chips for 60 seconds.
Take the bowl out from microwave and Mix well with spoon until all the chocolate melts and it is in liquid form.
Add brown sugar in melted chocolate and mix again with spoon.
Add all purpose flour into melted chocolate and sugar and mix well.
Warm milk for 30 secods, add it to chocolate and flour batter and mix well until the batter is smooth.
Add walnuts to batter and mix well with spoon.
Take microwave safe dish and lined with parchment paper and brush with butter.
Pour brownie batter into dish.
Garnish brownie batter with walnut and chocolate chips
Microwave brownies for 4 minutes.
Take the brownies out and put it on cooling rack.
Once it is cool, cut the brownies into square pieces.