The recipe is from one of the American sites.
| Flour | 2 cups＝288g |
| Cocoa powder | 2/3 cup＝90g |
| Salt | 1/4 tsp＝1.25g |
| Baking soda | 3/4 tsp＝3.5g |
| Butter, softened | 1 cup＝227g |
| White sugar | 1 1/2 cups |
| Egg | 2 |
| Vanilla extract | 2 tsp |
| Semisweet chocolate chips | 2 cup |
| Chopped walnuts(optional) | 1/2 cup |
1. 前四项分类过筛混合
2. 软化黄油加入白糖打发
3. 往步骤2分次加入两个鸡蛋和香草精
4. 往步骤3加入粉类，搅匀
5. 最后加入半甜巧克力碎和核桃（可选）
