In a medium bowl whisk together the flour, baking soda and salt. Set aside.
In a medium bowl melt the chocolate and butter either in the microwave or place chocolate and butter in a medium bowl and place over a small pot of boiling water make sure water does not touch bowl with chocolate, heat until butter has melted then whisk together until smooth. Set aside.
Stir the powdered sugar into the melted chocolate with a whisk or spatula, combine until smooth, add the room temperature egg and vanilla, stir well to combine, add the flour mixture, stir to form a soft dough. Cover the bowl in plastic wrap and refrigerate for approximately 30-60 minutes.
Pre heat oven to 375F/ 190C. Line 1-2 cookie sheets with parchment paper.
Roll pieces of dough into 1 inch balls*, place on cookie sheets and bake for approximately 8-10 minutes. Dust with Icing/powdered sugar if desired. Enjoy!
*At this point you can refrigerate the dough balls for about 15-20 minutes while the oven is pre-heating.
Notes
If your cookies come out extra fluffy and still round from the original ball shape, you can gently flatten the cookies, if you like, right after they come out of the oven with the bottom of a glass.If you accidentally leave the chocolate dough balls in the refrigerator too long, just leave them out at room temperature for a few minutes or until they soften up a little more before baking. If you bake them directly from the refrigerator and they are too cold, they may take a little longer to bake.Store the baked cookies in an airtight container at room temperature. They will last up to 3-4 days at room temperature. Refrigerating sugar cookies will dry them out and make them hard.You can either freeze the cookie dough, wrap it well in plastic wrap then place in a freezer safe container or bag. The dough will last up to 3 months. To make it even easier you can freeze the cookie dough balls.Place the balls on a cookie and freeze until firm, then move the frozen cookie balls into a container or bag. They will keep for up to 3 months in the freezer. They can be baked from frozen, just add a couple of minutes longer to the baking time.Freeze the completely cooled cookies in a freezer safe container. They will keep for up to 3-6 months in the freezer.