Pre-heat oven to 350 degrees F
Mix together dry ingredients - flour, baking soda, and cocoa powder. Mix together wet ingredients - sugar, brown sugar, egg, vanilla extract, mint extract, unsalted butter, and milk. Slowly add dry ingredients to wet ingredients. Then fold in white or mint chocolate chips.
Grease each muffin cup in muffin tin with vegetable oil.
Scope ~2 tablespoon of dough into each muffin cups, and fill it to almost full. Gently create a hole in the middle of the dough.
Bake in oven for 12-14 minutes.
Remove muffin tin from oven and and cool for 10-15 minutes. The middle of the cookie should sink in creating a "cup" shape. Then remove each cookie cup from the muffin tin, and cool further on the drying rack.
Add vanilla ice cream onto the cookie cup. Serve and enjoy!