Baking Step:

1. Preheat oven at 190°C.
2. Using paddle attachment, mix all the ingredients except walnut and chocolate chip at low speed 1 minute.
3. Scrap down the bowl and continue to mix for another 4 minutes at medium speed.
4. Deposit the batter into paper cups or muffin mould until 1/3 full. Sprinkle some chocolate chip on top of batter.
5. Bake for 25 to 28 minutes, or until a toothpick inserted in the middle comes out clean. Decorate as designed.