Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper or a silicone baking mat.
In a large mixing bowl, whisk together the flour, sugar, baking powder, salt, and orange zest.
Add the cold, cubed butter to the dry ingredients. Use a pastry cutter, fork, or your fingers to cut the butter into the flour mixture until it resembles coarse crumbs with pea-sized pieces of butter.
In a separate bowl, whisk together the heavy cream, egg, and orange juice.
Pour the wet ingredients into the dry ingredients and mix gently with a spatula or wooden spoon until just combined. Do not overmix—the dough should be slightly sticky and shaggy.
