Preheat oven to 350 degrees F (175 degrees C). Grease an 8x8 inch baking pan.
In a large bowl, cream together butter and sugar until light and fluffy. Add in the vanilla, eggs, and beat until light and creamy.
In a separate bowl, whisk together the flour, cocoa powder, baking powder, and salt. Gradually add the dry ingredients to the wet ingredients and mix until just combined.
Stir in the chocolate chips. Spread the batter evenly into the prepared baking pan.
Bake for 20 to 25 minutes in the preheated oven, or until a toothpick inserted into the center comes out clean. Allow cookies to cool before cutting into bars.
Interesting Facts
This recipe is a great way to satisfy both a cookie craving and a brownie craving in one!
Using melted butter instead of softened butter will give the cookies a chewy texture.
You can substitute semi-sweet chocolate chips with dark chocolate chips or white chocolate chips.
These cookies can be stored in an airtight container for up to a week.