- Preheat the oven to 350F. Lightly grease a 9″ x 13″ pan. 
- In a saucepan set over low heat, melt the butter, then add the sugar and stir to combine. Return the mixture to the heat briefly, just until it’s hot (about 110 Fahrenheit to 120 degrees Fahrenheit) but not bubbling.  - 2 sticks Unsalted Butter, 2-¼ cups Granulated Sugar 
- Place the eggs in the stand mixing bowl, and beat using a flat paddle attachment with the cocoa powder, salt, baking powder, espresso powder and vanilla extract until smooth about 30-45 seconds. - 4 Eggs, 1-¼ cups Dutch-Process Cocoa, 1 teaspoon Salt, 1 teaspoon Baking Powder, 1 teaspoon Espresso Powder, 1 tablespoon Vanilla Extract 
- Begin to carefully pour in the the hot butter/sugar mixture while the stand mixer is on a low speed. Stir in until smooth. 
- Add the flour and 1 cup of the chocolate chips. Mix on speed one and gradually increase the speed until smooth and no flour is present.  - 2-¼ cups All-Purpose Flour, 2 cups Chocolate Chips 
- Pour the batter into the lightly greased 9″ x 13″ pan. Then top with the remaining 1 cup of chocolate chips.  - 2 cups Chocolate Chips 
- Bake the brownies for 30 minutes, until a toothpick inserted into the center comes out almost clean-- with just a few moist crumbs clinging to it. The brownies should feel set on the edges, and the center should look very moist, but not uncooked. Remove them from the oven and cool on a rack for at least 30 minutes before cutting and serving.