Once your butter is melted, add the sugar, vanilla extract, and espresso powder to the bowl. Crack the two eggs over the side of the bowl and discard the shells. Beat the eggs with the other ingredients until well-combined.
Now’s a good time to mention that if you want to add some extras, like chocolate chips, to the brownies, you can. “You could definitely add chocolate chips to make them extra chocolatey,” Morone shares. “But if you do that, and you try to check for doneness with a toothpick, you have to be mindful that if you put the toothpick through a chocolate chip, the brownies might seem like they aren’t done when they actually are.”
Finally, add the dry ingredients, including the flour, cocoa powder, and salt to the wet ingredients. Gently mix them until you form a smooth batter.