1. Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
2. In a large bowl, whisk together the flour, sugar, baking powder, and salt.
3. Add the cold butter cubes to the flour mixture. Using a pastry cutter or your fingertips, blend the butter into the flour until the mixture resembles coarse crumbs.
4. Gently fold in the blueberries and lemon zest, taking care not to crush the berries.
5. In a separate bowl, whisk together the heavy cream, egg, vanilla extract, and lemon juice until well combined.
6. Pour the wet ingredients into the dry ingredients, stirring gently until a dough begins to form. Be careful not to overmix; the dough should be slightly sticky.
7. Turn the dough out onto a lightly floured surface and gently pat it into a 1-inch thick circle. Cut the dough into 8 wedges and place them on the prepared baking sheet.
8. Sprinkle the tops of the scones with extra sugar if desired for a sweet, crunchy finish.
9. Bake for 18-20 minutes, or until the scones are golden brown on top. Let them cool on the baking sheet for a few minutes before transferring to a wire rack.

As I often say, cooking is a dance between patience and creativity. Feel free to adjust the lemon or blueberries to suit your taste. Sometimes, I even throw in a handful of chopped nuts for an added crunch.