Preheat the oven to 175℃.
Line a baking tray with some parchment paper or silicon mat.
Sieve flour, cocoa powder and baking agents into a mixing bowl.
Add 1-2 tbsp peppermint candy powder. Mix well.
If you want to can add ½ tsp peppermint extract for a more minty flavour.
In another mixing bowl add butter and brown sugar.
Cream till the mixture becomes soft and creamy.
Add the flour mixture. Mix everything and make a dough.
Add 1-2 tbsp milk and mix gently. You should get a soft dough that does not crack when you roll it.
Take about a tablespoon of the dough. Roll it into a ball.
Roll the ball in the white sugar to coat.
Place it on the baking tray.
Repeat the same with the remaining dough. You will get about 16-18 cookies.
Place the cookie dough balls about an inch apart in the baking tray.
Take a ½ tsp measuring spoon or use the back of a wooden spoon or your thumb.
Press the cookie balls gently in the middle. It will flatten a bit and also create an indent.
Put the tray in the preheated oven for the cookies to bake. Total baking time is 13-15 minutes.
After 10 minutes, check the cookies. If the indents have closed them remove the tray from the oven.
Gently press down again using a spoon or back of the wooden spoon.
Bake for 3-4 minutes.
Remove the tray from the oven. The cookies initially will appear soft.
Allow them to rest on the tray for 2-3 minutes. Then transfer them to a wire rack to cool completely.