Sift the cake flour, cocoa powder, and baking powder together.
Break the chocolate bar into about 2 cm squares.
Place room temperature butter in a bowl. Add the white sugar and stir until the mixture becomes white.
Add the beaten egg, a little at the time, and mix well.
Now add Steps 1 and 2 in order to the butter mixture and combine with a rubber spatula. The mixture will be firm, but mix well until the flour disappears.
Line a baking tray with parchment paper and then use a spoon to scoop on the mixture.
Bake in preheated oven at 170℃ for 20 minutes.
Story Behind this Recipe
I was re-arranging my Praline Cookie recipe. I ran out of chocolate chips, so I used a chocolate bar instead. Chunks of chocolate gave these cookies a nice texture and I thought it actually better than the original recipe.
If you chill the cookies in the fridge, the chunks of chocolate turn crunchier and more delicious.