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Heat oven to 350°F.
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Beat butter and sugar until well blended. Add the egg and vanilla. In a separate bowl, mix together 2 cups flour, baking powder and salt. Gradually add into butter mixture. This mixture will still be sticky.
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Divide dough mixture in half in two separate bowls. Add 2 tablespoons flour to one bowl and the 2 tbsp cocoa powder to the other bowl. I use a ½ tbsp. measuring spoon to measure out a portion from each bowl. Roll the dough together to create a marbled ball. Place balls on a parchment lined cookie sheet.
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Bake 11 - 13 minutes or until cookies are set. Allow cookies to cool for no longer then 1 minute then working quickly, press a chocolate into center of each cookie. Allow the cookies to cool for another 20 minutes on the cookie sheet before transfering to a wire cooling rack. Make sure the chocolate has hardened again before storing in an airtight container.
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Should make about 48 cookies.