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Combine the dry ingredients in a large bowl and mix well.
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Cut the cold butter into small pieces and cut into the flour mixture (using either your fingers or a pastry cutter) until you have pea-sized or slightly larger pieces.
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Add the buttermilk, chocolate, and vanilla and gently mix together.
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Turn out the dough onto a floured surface and gently knead the dough two or three times using the heel of your hand until it just begins to hold together. Do not over mix - you want chunks of butter!
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Form the scones either by cutting into traditional shape or packing tightly into an ice cream scoop.
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Freeze on an ungreased sheet pan for at least two hours. If making ahead, wrap tightly with plastic wrap once frozen and bake within one month.
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When ready to bake, preheat your oven to 350 degrees (180C). Brush with an egg wash and sprinkle liberally with sugar.
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Bake from frozen for approximately 30 minutes, or until nicely browned.