Best Chocolate Brownie

Ingredients

32 gr flour
12 gr unsweetened cocoa
5 gr baking powder
1 gr salt
280 gr bittersweet chocolate
34 gr butter
3 eggs
150 gr granulated sugar
4 gr pure vanilla extract
60 ml sour cream
1 coarsely
2 cake
10 secon sour cream

Instructions

NOTES : adapted from Marcel Desaulniers, Death by Chocolate