Preheat your oven to 400°F (200°C) and prepare a baking sheet by lining it with parchment paper to prevent sticking.
In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, and salt until well combined, ensuring there are no lumps.
Add the cold, cubed butter into the flour mixture. Using a pastry cutter or your fingertips, blend the butter into the dry ingredients until the mixture resembles coarse crumbs, similar to pea-sized pieces.
Gently fold in the cranberries and the zest of the orange, ensuring that they are evenly distributed throughout the mixture.
Gradually pour in the heavy cream, stirring gently with a spatula or wooden spoon just until the dough begins to come together. Take care not to overmix; it's okay if there are a few dry bits remaining.
Dust a clean surface with flour and turn out the dough. Gently knead it a few times, just until it’s smooth and holds together, being careful not to overwork the dough.
Shape the dough into a circle approximately 1-inch thick. You can either cut the circle into wedges for traditional scones or use a round biscuit cutter for a more uniform shape.
Arrange the scones on the prepared baking sheet, leaving space between each one. Brush the tops lightly with the beaten egg to achieve a beautiful golden color when baked.
Bake in the preheated oven for 15-20 minutes, or until the scones are golden-brown on top and a toothpick inserted into the center comes out clean.
Once baked, remove the scones from the oven and transfer them to a wire rack to cool slightly before serving for the best texture and flavor.
Notes
Serve warm on a platter, dusted with powdered sugar and garnished with fresh cranberries and orange slices.