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Whisk flour, cocoa powder, baking powder, and salt in medium bowl until mixed and set aside.
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Using electric mixer, beat the butter in large bowl until smooth and fluffy. Add the sugar and mix on medium high speed until the yellow color lightens and has a creamy consistency.
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Add the eggs one at a time mixing completely before adding the next. Add the mint extract and vanilla extract.
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Add dry ingredients and beat just until blended this dough will be sticky.
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Divide the dough into two balls and wrap with plastic wrap rolling into log shapes and refrigerate for at least 2 hours.
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After the dough has chilled, preheat to 350°F.
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Line 2 baking sheets with parchment paper.
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Working with one ball of dough at a time, keeping the other in the fridge while you work. Unwrap the dough and working quickly roll the dough to make a smooth cylinder and using a sharp knife cut into 1/4 inch thick cookies placing them onto the prepared cookie sheets leaving about an inch between them.
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Bake the cookies for 10-15 minutes or until the edges just start to change color.
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Place on a cooling rack and allow them to cool completely.
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Once they are cooled prepare the topping by melting the semisweet chocolate over a double boiler until smooth and shiny. If you leave it on the eat too long the chocolate will set with a mat finish. Set aside to cool slightly. Test the chocolate by dipping a spoon in, the chocolate should evenly coat the spoon and not quickly run off.
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Dip the cookies into the chocolate one at a time flipping them quickly and placing them on a cooling rack to set.
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Once cooled completely enjoy!