Melt the butter, stir in sugar and vanillaextract.
Add the flour, cocoa powder and baking powder.
Add the walnut (grind half of the walnut the other half cut into small pieces) and oatmeal too.
Stir in the eggs, and chocolate chunks.
When all the ingredients are well combined, form little balls (a little bit press top of the balls) out of it and bake at 350 F (180 C) for around 20 minutes and enjoy!
NOTES
The above figures assume a cup with a volume of 250 ml.