For the Frosting:
¼ cup (about 55g) unsalted butter.
¼ cup (about 30g) cocoa powder.
¼ cup (about 60ml) whole milk.
2 cups (about 250g) powdered sugar.
1 tsp. vanilla extract.
Please note that the chopped walnuts in the brownies are optional, so you can omit them if desired.
Directions:
LIRE LA SUITE..