INGREDIENTS
1/2 cup
unsalted butter, room temperature
Zest from 1 lemon
3/4 cup
granulated sugar
1
large egg, room temperature
1 tsp
pure vanilla extract
2 cups
unbleached all-purpose flour (divided)
2 tsp
baking powder
1/2 tsp
sea salt
2 cups
fresh, ripe blueberries
1/2 cup
buttermilk
1 tsp
turbinado sugar for sprinkling