01 - Preheat the oven to 400°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, poppy seeds, baking powder, baking soda, and salt.
03 - Add the cold butter and lemon zest to the dry ingredients. Use a pastry cutter or fingertips to blend until mixture resembles coarse crumbs.
04 - Whisk heavy cream, egg, vanilla extract, and lemon juice together in a separate bowl.
05 - Pour wet ingredients into dry ingredients. Stir gently with a fork until just combined; avoid overmixing.
06 - Turn dough onto a lightly floured surface. Pat into a 1-inch thick round and cut into 8 wedges. Transfer wedges to the prepared baking sheet.
07 - Brush scone tops with a little heavy cream. Bake for 16–18 minutes until golden brown. Cool slightly on a wire rack.
08 - Whisk powdered sugar with lemon juice to achieve a drizzle consistency. Drizzle over warm scones if desired.