Preheat the oven to 350° and prepare a baking sheet with parchment paper and set aside.
Melt the butter in a saucepan over medium heat or microwave for 30 seconds until melted.
Add the chocolate chips to the melted butter and stir until combined. Set chocolate mixture to the side.
In a medium bowl, whisk together the flour, cocoa powder, baking powder and salt. Set to the side
Using a hand mixer (or stand mixer), beat the eggs and brown sugar in a large bowl on medium high speed for 3 minutes until fully combined and frothy.
Next, carefully pour the melted chocolate mixture into the whipped egg mixture until the chocolate is just combined.
Fold in the dry ingredients with a spatula and mix until a loose batter is formed.
Using a cookie scoop or tablespoon, scoop the dough and place onto the prepared baking sheet 2 inches apart.
Bake the cookies for 13 minutes at 350.
At the 13-minute mark, remove the chocolate brownie cookies from the oven. The tops of the cookies should have a crackly texture.
Let the cookies cool for 10 minutes. Then dust each with powdered sugar. Enjoy!