Preheat the oven to 325°F and gather several mixing bowls.
In large bowl or bowl of a stand mixer, use mixer to cream the 1/2 cup of butter, shortening and sugar until light, about 2 minutes.
Meanwhile in a small mixing bowl, slowly stir together the melted butter and cocoa powder until smooth.
Slowly add cocoa mixture to butter and sugar mixture, followed by vanilla extract. Mix between additions.
Whisk or sift ground cardamom, flour and baking ammonia together until there are no clumps. Do not smell or sniff baking ammonia directly.
Slowly add flour mixture to wet mixture.
Using a small cookie scoop or teaspoon, scoop dough and roll into small balls. Roll each ball of dough into granulated sugar, completely coating the outside of the dough ball.
Place dough balls on parchment or silicone lined baking sheets. Bake for 20 minutes, or until centers are completely set.
Allow to cool on baking sheet 1-2 minutes after removing from oven, them move to a wire rack to cool completely.