Liquefy the butter in a saucepan (or in the microwave). Mix with the sugar, vanilla extract and eggs. Add the flour and cocoa powder (ideally sieve beforehand) and stir until creamy. Put the dough in a small square greased dish.
Bake in the preheated oven at 160 ° C - 170 ° C for about 25 - 35 minutes.
The amount is enough for approx. 24 pieces.
Tip: You can refine the recipe with different nuts depending on your mood. It tastes best with pecans or walnuts.
For a special treat, the brownies can also be served hot with vanilla ice cream or walnut ice cream.