You can find the original recipe here.
I won't post the whole recipe because it is out there and easy to find but I did have to translate the measures into real ones - you know, grams, etc, so here they are.
150g plain flour
60g unsweetened cocoa powder
1/4 tsp salt
1/4 tsp baking powder
1 tsp vanilla
1 tsp coffee powder or granules pushed through a sieve.
(I added this to the dry ingredients.)
For the method, follow the link above
And here is Kristen's photo of them. Yes, mine look just like that! Nom nom nom, as my daughter would say.