1. Add brown sugar to butter and beat until fluffy
2. Add the eggs, sift in the flour and mix well
3. Add walnuts and chocolate beans, mix well, and refrigerate for 30 minutes
4. Divide the dough into about 20g each, make pancakes and put them into the baking tray
5. Preheat the oven to 175 degrees, and heat the middle layer up and down for about 20 minutes.