I got this recipe from Family Fun magazine about a year ago, and finally just tried it yesterday. They were really good!
3/4 c melted butter
1/2 c cocoa
1 c sugar
2 eggs
2 tsp vanilla
2 c flour
1 tsp baking powder
1 tsp baking soda
1/2 tsp salt
6 ounces mini chocolate chips (I just used regular chocolate chips)
3/4 c powdered sugar
In a large bowl, mix together the melted butter, cocoa, and sugar. Whisk in the eggs and vanilla extract. In a medium-sized bowl, stir together the flour, baking powder, baking soda, and salt. Use a large spoonj to slowly add the dry ingredients to the chocolate mixture. Stir in the chips. Refrigerate the dough for 2 hours. Heat the oven to 350. Form the dough into 1-inch balls, then roll them in powdered sugar. Bake the cookies on an ungreased baking sheet for 10 minutes. Let cool for 5 minutes then lightly dust the cookies with the remaining powdered sugar. Makes 4 dozen.