Combine flour, baking powder and salt; set aside. Melt chips in microwave on high 1 minute, stir then on high for 30 seconds, stir; repeat until melted. Beat butter and sugar until creamy. Add melted chips and vanilla. Beat in eggs. Gradually add flour mixture. Chill dough until firm. Preheat oven to 350 degrees. Shape dough into 1 inch balls, coat with powdered sugar and place on increased cookie sheets. Bake 10-12 minutes until tops become cracked. Let stand 5 minutes on cookie sheet. Cool completely. (I noted 13 minutes)