Melt butter and chocolate in the microwave and mix until smooth and homogeneous

Add the eggs one by one mixing very well each time

Add sugar, coffee, salt, vanilla (in that specific order) every time mixing well

Add the flour and mix until smooth and homogeneous. Once the mixture is homogeneous stop! (Overdoing it can mess it up)

Bake at 170-180 C for 15-20 min. With a toothpick check the inside assuring it comes out with some humidity and not completely dry.

Enjoy!