Heat oven to 350°F. Line baking sheets with parchment paper.
In a medium bowl, whisk flour, cocoa powder, baking soda, and salt. 2 cups all-purpose flour,1/2 cup unsweetened cocoa powder,1 teaspoon baking soda,1/2 teaspoon salt.
In a large bowl, beat butter, granulated sugar, and brown sugar until light and fluffy, about 3 minutes.3/4 cup unsalted butter,1 cup granulated sugar,1/2 cup light brown sugar.
Add eggs and vanilla extract and mix until combined.2 large eggs,1 teaspoon vanilla extract.
Gradually add the dry ingredients to the wet ingredients and mix until just combined.
Stir in the chocolate chips.1 cup semi sweet chocolate chips.
Scoop rounded tablespoons of dough onto prepared baking sheets about 2 inches apart.
Bake 9 to 10 minutes until the edges are set and the centers look slightly soft.
Cool on the baking sheet 5 minutes before moving to a wire rack.
Notes
Recipe Tips: Don't over bake these cookies! They should look slightly underdone in the center when you pull them from the oven. This ensures they stay chewy and fudgy instead of turning into a dry cookie.