Preheat your oven to 400°F (200°C). Line the baking sheet with parchment paper.
Combine the dry ingredients. In a mixing bowl or the bowl of a stand mixer, combine flour, sugar, baking powder, and salt.
Cut the butter into the flour mixture. Incorporate the butter into the flour mixture using either a pastry blender or by gently pressing the pieces between your fingers until they resemble pea-sized crumbles. Then, add the diced apples.
Make the dough. In a separate small bowl, whisk together the cream and egg until well combined. Pour this mixture over the flour mixture and gently blend it in with your hands or a silicone spatula, ensuring the mixture is mostly moistened but still somewhat crumbly.
Knead and slice to wedges. Turn the dough out onto a lightly floured surface and knead it gently a few times to form a ball. Flatten the dough into an 8-inch circle, then slice it into 8 wedges.
Chill the dough wedges. Arrange the wedges on a small baking sheet lined with parchment paper or a silicone baking mat and place them in the freezer for 20 minutes to firm up.
Place in pan and garnish. After the chilling time, transfer the scones to a larger baking sheet, spacing them about 2 inches apart. Lightly brush the tops with additional cream and sprinkle sugar over them.
Bake in the preheated oven for approximately 20 to 25 minutes, or until the scones' tops turn a light golden brown, and their bottom edges become golden. Allow them to cool for at least 10 minutes before serving.