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In a large bowl, mix the cocoa powder, white sugar, brown sugar, melted chocolate, and vegetable oil.
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Next, add in eggs one at a time, and beat until fully combined.
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Stir in the vanilla extract.
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In another medium bowl, whisk together the flour, baking powder, and salt.
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Add the dry ingredients into the wet chocolate mixture and beat just until a dough forms. Cover the bowl with plastic wrap and refrigerate for at least 4 hours or overnight.
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When ready to bake, preheat oven to 350 degrees F.
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Line 2 cookie sheets with parchment paper.
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Add the confectioner's sugar to a smaller bowl.
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Roll about 1 1/2 - 2 tablespoons of dough into a ball.
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Generously roll each dough ball in confectioners' sugar to coat evenly and place onto the prepared cookie sheets.
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Bake in the preheated oven for 10 minutes (for smaller cookies) or 12 minutes (for larger cookies).
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The cookies will be a bit soft when they come out of the oven but will harden up once they cool completely.
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Cool on wire racks for 10-15 minutes and serve.