chocolate espress cookies

Brownie-like chocolate espresso cookies. Eat several of them without feeling like a little piggy!
Ingredients
2 cups (around 16 oz.) bittersweet chocolate, chopped
4 tablespoons of butter, softened
4 eggs
1 cups of granulated sugar
1 teaspoon vanilla extract
cup of all-purpose flour
teaspoon baking powder
1 tablespoon espresso
1 cup semisweet or bittersweet chocolate chips
Source Link: http://www.petitekitchenesse.com/2011/03/04/chocolate-espresso-cookies/