1. **Preheat the Oven**: Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
2. **Mix Dry Ingredients**: In a large bowl, whisk together the flour, sugar, baking powder, and salt.
3. **Cut in the Butter**: Add the cold butter to the dry ingredients and use a pastry cutter or your fingers to mix until the mixture resembles coarse crumbs.
4. **Combine Wet Ingredients**: In a separate bowl, mix the heavy cream, lemon zest, vanilla extract, and egg until well combined.
5. **Combine Mixtures**: Pour the wet mixture into the dry ingredients and stir until just combined. Be careful not to overmix.
6. **Shape the Scones**: Turn the dough onto a floured surface and gently knead it a few times until it comes together. Pat it into a circle about 1-inch thick. Cut into wedges or use a biscuit cutter for round scones.
7. **Bake**: Place the scones on the prepared baking sheet and bake for 15-20 minutes, or until golden brown.
8. **Make the Glaze (optional)**: While the scones are baking, whisk together powdered sugar and lemon juice until smooth. Adjust the consistency with more lemon juice or powdered sugar as needed.
9. **Cool and Glaze**: Let the scones cool for a few minutes, then drizzle with the glaze and sprinkle with extra lemon zest, if desired.
10. **Serve**: Enjoy warm or at room temperature!
These lemon cream scones are sure to be a hit! Enjoy!