Preheat oven to 350ºF.
Combine flour, baking powder, salt, and sugar in a bowl or food processor.
Cut butter into the flour mixture or pulse in a food processor until it resembles crumbs.
Make a well in the center and add egg, whisk lightly.
Add cream, lemon juice, zest, and extract and stir until combined.
Add the blueberries and stir until blueberries are incorporated.
Turn onto a lightly floured surface and work into a ball, pressing any blueberries that fall back into the dough.
Flatten into a circle one inch thick.
Cut into eight wedges.
Place wedges onto an ungreased or parchment-lined baking sheet.
Bake for 18-20 minutes until the bottoms and edges begin to brown and the scones are cooked through.
Remove from oven and allow to cool.
Whisk icing ingredients together and drizzle over scones.