Put flour, cocoa powder, fine sugar, salt, vegetable oil, eggs, chocolate beans, milk and vanilla extract into a large bowl

2. Mix all the ingredients evenly with a spoon

3. Pour them into a cup that can be used in a microwave oven. Originally, they were poured into a large mug. I think this cup is too big, and one person feels a little guilty when eating it. Put it in the microwave oven and put it on high heat for 2 minutes (this is the time and firepower needed to make a large mug, which can be adjusted according to the power of our own microwave oven and the weight of the cake. For a small bowl like mine, it can be put on medium-high heat for 2 minutes)

5. Then take out the baking bowl and sprinkle with powdered sugar.