Preheat oven to 350°F. Line an 8 x 8 inch pan with parchment paper.
In a bowl of stand mixer, cream butter and sugar on high speed until light and fluffy.
Add in remaining ingredients. For the melted chocolate chips, make sure they are completely melted and have been stirred into a smooth melted chocolate mixture before adding it to the batter. Also try to scrape up as much of the melted chocolate as possible into your batter. Mix ingredients on medium speed until smooth batter forms.
Scoop batter into prepared pan. The batter will be thick and very sticky. Using a spatula, do your best to spread the batter evenly across entire pan until it reaches the edges. Don't worry if the surface is not smooth, it will flatten and smooth out when baking. Bake for about 25 minutes until batter is set. Let brownies cool for about 30 minutes to 1 hour before cutting and serving.
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.