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Combine flour, baking powder, and 1/4 tsp salt; set aside.
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Melt 1 cup of chocolate chips; stir until smooth.
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Beat butter with a mixer on medium speed for 30 seconds.
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Beat in granulated sugar until combined.
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Beat the melted chocolate into the creamed mixture, then add eggs, vanilla and mint extract.
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Stir flour mixture and remaining chocolate chips into chocolate mixture.
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Wrap dough in plastic wrap and freeze for 30 minutes or until easy to handle.
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Preheat oven to 350°F.
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Shape dough into 1 inch balls; roll balls in powdered sugar.
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Place balls 2 inches apart on ungreased cookie sheets.
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Bake for 10-12 minutes.
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Cool on cookie sheets for 2 minutes.
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Remove from cookie sheets and cool completely on cooling racks.
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Preparation time does not include chilling time.