1-1/2 cups flour
1-1/2 tsp baking powder
1/4 tsp salt
1-1/2 cups mint chocolate chips
6 T butter; softened
1 cup sugar
1-1/2 tsp vanilla extract
2 eggs
powdered sugar

Combine flour, baking powder and salt; set aside. Over hot (not boiling) water, melt 1 cup chocolate chips, stirring until smooth. (or melt in the microwave) Beat butter and sugar until creamy. Add melted chocolate and vanilla. Beat in eggs. Gradually beat in flour mixture. Stir in remaining 1/2 cup chocolate chips. Wrap dough in plastic wrap; chill until firm. Preheat oven to 350 degrees. Shape dough into 1" balls; roll in powdered sugar. Place on ungreased cookie sheet. Bake 10-12 minutes, until tops appear cracked. Let stand 5 minutes on cookie sheet. Remove and cool completely.