Pre heat the oven to 185C. Grease a 6″ pan with oil or butter and line with parchment paper.
In a bowl, add flour, cocoa powder, baking powder, baking soda and whisk well.
Add hot water to the instant coffee powder, mix well.
Add the hot coffee, oil, milk, curds, and vanilla. Mix using a wire whisk so that no lumps remain. If the batter is too thick, add a couple of tablespoons of milk to thin it out.
Using a spatula mix again, then add roughly crushed oreo cookies to the batter and mix well.
Transfer the batter to the greased and lined pan. Bake for about 30 - 40 minutes or until a skewer comes out free of crumbs when inserted in the middle of the cake.
Take the cake out of the oven, let it rest in the pan for about 5 - 10 minutes.