1, butter: 8 1g/ heiqiao: 8 1g/ fine sugar: 48g；; Whole egg: 1/ low flour: 27g/ baking powder: 2g; Salt: 2g/ crushed walnut: 15g.

2. Chocolate melts in water.

3. Melt butter and mix with chocolate.

4. Add sugar to the melted chocolate and stir the whole egg liquid evenly.

5. Add low flour and baking powder and mix well.

6. Add chopped walnuts and mix well.

7. Pour into a square mold and bake at 170 for 25 minutes.

8. After baking, cover the surface with a layer of marshmallows, with big fire 190, big fire 170 and baking 10 minute.

9. After baking, pour in the appropriate amount of caramel sauce.