Step 1

First, preheat the oven to 350 degrees Fahrenheit.  Line an 8-inch square pan with parchment paper.

Step 2

Melt butter in a microwave-safe bowl.

Step 3

Stir chocolate chips into melted butter.  Stir until completely creamy.

Step 4

In a large mixing bowl, add sugar, brown sugar, and eggs.  Whisk vigorously for 2 minutes, until light and frothy.

Step 5

Then, pour in the melted chocolate mixture.  Stir to combine.

Step 6

Sift in the flour, cocoa powder, espresso powder, and sea salt.  Stir until a thick batter forms.

Step 7

Transfer brownie batter to the lined pan.  Smooth into one even layer.

Step 8

Bake for 25 to 30 minutes or until a toothpick inserted comes out with only moist crumbs.

Step 9

Finally, remove from oven.  Allow brownies to fully cool before slicing and serving.