powdered sugar
Melt the butter and chocolate together. Let cool.
Sift together flour, baking powder, and salt. Add to cooled chocolate to flour mixture.
Beat in sugar and eggs for 1 minute. Chill at least 15 minutes.
Shape into 1 inch balls. Roll in powdered sugar. Place on greased cookie sheets. Bake at 300 degrees F for 15 to 18 minutes.