How to make fudgy brownies

I'm trying out the 10-Ingredient Brownie recipe from TASTY for the first time.

Ingredients:

Chocolate - 227g
Cocoa Powder - 3/4 Cup
Espresso/Coffee - 1/2 Cup
Unsalted Butter - 2.5 Sticks (284g)
Eggs - 6
Granulated Sugar - 2 Cups
Brown Sugar - 1/2 Cup
Salt - 2 tbsp
Vanilla Extract - 2 tbsp
All-purpose Flour - 1 Cup