Preheat oven to 400 degrees F.
In a large bowl, evenly combine flour, sugar, baking powder, and salt. Using a pastry blender (you can also use your fingers or a fork), work in the very cold butter into the dry ingredients, until small pea-size crumbs form.
Stir in dried cranberries and cold dark chocolate chunks and combine.
In a separate bowl, whisk eggs, ½ cup heavy cream, vanilla extract.
Slowly add the wet ingredients to the dry ingredients, and stir with a fork until moist. Do not knead or overwork the dough. You’re looking for a dough that’s crumbly and loose at this point.
In a lightly floured surface, bring crumbly dough together with your hand and lightly press and work the dough until it comes together.
Using a knife or a bench scraper, divide the dough in half. Form 2 circles, about 3/4 inch thick. Place each circle on 1 large baking sheet (or 2 smaller ones), lined with parchment paper. Using a knife or bench scraper, divide each circle 6 wedges. Optional: if you have time and space, place these in the freezer for 15 minutes.
Brush the top with heavy cream. Bake for for 20-25 minutes, until golden brown. Remove from oven and let them cool down.
Once the scones have cooled down, prepare the chocolate glaze: In a bowl, evenly mix cocoa powder with confectioners sugar and salt. in separate medium bowl, combine hot water and melted butter. Pour water and butter mixture into dry ingredients, whisking as you go until smooth.
Drizzle scones with the chocolate glaze. The chocolate glaze will harden when it cools down.