In a large mixing bowl, combine flour, sugar, baking powder, and salt, and whisk together.
Cut one stick of cold/frozen butter and add to the flour mixture. Pulse with mixer/food processor until the small pieces of butter are coated with flour and create pea-sized coarse crumbs. (See notes if mixing by hand.) Stir in the orange zest and chopped cranberries.
In a medium bowl, whisk together sourdough discard, egg, and heavy cream.
Pour the wet ingredients into the dry ingredients. Mix the scone dough until the mixture is just combined. Be careful not to overmix the dough.
Turn out the dough onto a clean surface and pat the dough into an 8-inch circle, about 3/4 of an inch thick. Cut it into 8 equal wedges with a bench scraper or a large knife.
Place wedges on a cookie sheet with parchment paper with space in between them. To bake right away, chill in the freezer for 30minutes while the oven preheats. For a longer ferment place in fridge. See notes for how to freeze for later.
Preheat the oven to 400 degrees f. With a pastry brush, brush the tops of the scones with extra cold cream and sprinkle with coarse sugar, if desired. Bake the scones for 20-25 minutes, or until the top of the scones are golden brown. Remove and serve warm!