Add remaining ingredients, whisking quickly to combine thoroughly.
Pour into molds or flat container.
Freeze for a few minutes until solid.
Remove from molds or cut into squares and store in air-tight container in freezer.
I make this one in an 8 x 8 baking dish lined with parchment. It is firm in a few minutes, and I remove it (using the parchment as handles), cut it into squares, stick it in a plastic ware container, label it, and pop it in the freezer. That is how I distinguish this from the Milk Chocolate Bars, which I make in molds.