Blend in a blender for about 2 minutes:
eggs, butter and banana.
After blending, transfer to a bowl and add the peanuts, oats, raisins and baking powder.
If you also want the vanilla essence, mix everything together.
Grease mold: I used powdered chocolate.
Preheated medium oven for about 30 minutes.
Note: That's right people, there's no sugar.
It's a wonderful cookie.