add vinegar to the milk and keep aside to curdle
line the Muffin tray with paper cups
preheat the oven to 180 degrees celsius
whisk together flour cocoa powder ,baking powder ,baking soda
seive twice and keep aside
whisk together curdled milk ,oil and chocolate essence if using
fold in the dry ingredients in to the wet ingredients and make a smooth and lump free batter
fill the batter in the paper cups until three fourth full
bake for 15 to 20 minutes or until Done