Preheat oven to 180 degrees. Line a baking tray with parchment paper
Sieve together flour cocoa powder, baking soda, baking soda.
Cream butter and brown sugar, till smooth. Add vanilla essence,and mix.
Add flour mix and form a dough. Add milk as required to make a dough. it will be a sticky dough. Cling wrap the dough and refrigerate it for 15 minutes.
Make balls of the dough, and flatten slightly with the palms.
Place the balls on parchment lined baking tray, keeping a distance in between(as they tend to spread while baking). Sprinkle a few chocolate chips on each ball.
Bake at 180 degrees for10-15 miutes. They will look a bit soft,but its ok. Cool them completely, they will become little crispier.
Enjoy your brookie with evening tea/ coffee.