Super Fudgy, Chewy Cocoa Brownies - cooking recipe

Ingredients

1/2 cup cold salted butter
1 1/3 cups granulated sugar
1/4 cup packed dark brown sugar
3 large eggs
1 1/4 teaspoons pure vanilla extract
1/2 cup cocoa (I use Hershey's Special Dark. Other types of cocoa may be used, but may make the brownies very sweet)
2/3 cup all-purpose flour
1/4 teaspoon salt
1/2 teaspoon espresso powder (optional, but does deepen the chocolate flavor)
1/2 cup bittersweet chocolate chips (optional)

Preparation

Preheat oven to 350 degrees.
Grease a 7\"x11\" pan and line with parchment paper. A 9\" x 13\" pan may also be used, but brownies will not be as thick and baking time may be reduced.
In a large bowl, cream together butter, granulated sugar, and brown sugar.
Add eggs and vanilla.
Add cocoa, flour, salt, and espresso powder and mix until well blended.
Stir in chocolate chips (optional).
Place into preheated oven and bake until a toothpick inserted into the center comes out with only a few, moist crumbs. Appx. 30 minutes.