Melt 1 cup of chocolate chips over low heat. Cream butter and sugar. Add melted chocolate chips and vanilla; beat in eggs; add flour mixture and remaining chocolate chips.
Step 3
Wrap in plastic and freeze until firm (about 20 minutes).
Step 4
Make small balls (1 inch); roll in confectioners' sugar. Place on ungreased cookie sheet and bake for 10-12 minutes at 350 degrees F (175 degrees C). Cool on wire rack.