Melt butter and chocolate together. I use special metal bowl with double bottom. You can use boiling water and two bowls instead. Or melt it in a microwave. Leave it to cool down.

In another bowl mix eggs and sugar. Try to make a nice foam and bubbles.

On the side,mix flour, cocoa an baking powder.

Add chocolate-butter mass to egg-sugar mass.

Stir it.

Add flower and stir until you get nice mixture.

When the mass is compact and ready...

Place it in a baking pan. If you don't have baking paper, you can coat the pan with butter and a bit flour,so it doesn't stick.

Put it in a heated oven: 180 degrees celsius, bake it for 30 minutes.

And after 30 minutes, you'll get this heaven. Bon apetit!