Step 1

Preheat oven to 350°F with a rack in the center of the oven.

Step 2

Prepare an 8×8″ baking pan by lightly spraying with cooking spray or greasing with butter. Line with parchment paper.

Step 3

In a medium saucepan, melt butter over medium heat and whisk in granulated and brown sugars. Lower heat and stir in buttermilk and 1/4 cup of the chocolate chips. Remove from heat and whisk in the eggs and vanilla.

Step 4

In a separate small bowl, whisk together the flour, cocoa powder, baking soda, baking powder and salt. Stir in the butter mixture until just combined.

Step 5

Stir in the chocolate chips.

Step 6

Pour into prepared brownie pan and spread evenly.

Step 7

Bake for about 25 minutes or until it begins to pull from the edges of the pan. It will still be a little gooey in the center.

Step 8

Remove from oven, cool completely (or at least until it is just lukewarm).

Step 9

Slice into 16 squares and serve.