Cut the dark chocolate and butter into small pieces and melt them in a medium bath and mix them thoroughly. When mixing with the dough, make sure that it is not too hot, but cool until it is not too hard.

In another bowl, beat the eggs at room temperature to a slight foam, then whisk the sugar to the point of ivory-colored white foam, dividing it into two to three times.

When the color is ivory, mix the melted chocolate and butter little by little in a warm state. Even if it's warm, if you put it all at once, the eggs may be cooked and it may not mix well, so add little by little and mix.

If mixed evenly, sift the flour and cocoa powder and mix well with a spatula.

Place 70% of the butter or iron plate mixture in a muffin mold and bake in an oven preheated to 170 degrees for 10 to 15 minutes. It's normal to wobble and soft.
Even if you apply this brother, the child will be vulnerable, so please take it out. I think it would be good to grill it using a silver foil cup and eat it right away.

I had a hard time taking pictures because the kids were weak. I think it's much better to use a cup than a mold. I think it would be good to put all the dough in the refrigerator and then take it out and bake it when it's hot. If you don't like sweet things, I won't recommend it. If you use a fork and cut it in half, it'll drip down. If you eat it in a hurry, it'll reach the roof of your mouth, so be careful.