4 ounces unsweetened chocolate
2 cups semisweet chocolate chips, divided
1/3 cup butter or margarine
1 cup granulated sugar
3 large eggs
1 1/2 teaspoons vanilla extract
1/2 cup all-purpose flour
2 tablespoons baking cocoa
1/4 teaspoon baking powder
1/4 teaspoon salt
In a microwave or double boiler, melt unsweetened chocolate, 1 cup of the chocolate chips and butter; cool for 10 minutes.
In a mixing bowl, beat sugar and eggs for 2 minutes. Beat in vanilla extract and the chocolate mixture.
Combine flour, cocoa, baking powder and salt; beat into chocolate mixture. Stir in remaining chocolate chips. Cover and chill for at least 3 hours.
Remove about 1 cup of dough. With lightly floured hands, roll into 1-inch balls. Place on ungreased baking sheets. Bake at 350 degrees F for 10 to 12 minutes or until lightly puffed and set. Cool on sheets for 3 to 4 minutes before removing to a wire rack to cool completely. Repeat with remaining dough. Dust with confectioners' sugar.
Yields about 4 dozen.