Preheat oven to 350 degrees. In large bowl cream together butter, sugar and eggs. In another bowl combine flour and baking powder. Melt chocolate in microwave. Slowly add dry ingredients to wet ingredients. Stir to combine. Add chocolate, milk and coffee. Mix well. Pour into a buttered 8'' square baking pan and bake for 30 minutes. Cool before serving.
Recipe Courtesy of Food Network Kitchens