Preheat the oven to 450 degrees. Line a large baking sheet with parchment paper.

In a large bowl, whisk together the flour, sugar, baking powder, salt, baking soda, and lemon zest.  Gently mix in the blueberries.

In a small bowl, combine the cold buttermilk and the slightly cooled melted butter. Stir until combined and small clumps form. It is ok if the mixture is lumpy. Stir in the vanilla.

Pour buttermilk mixture to dry ingredients and stir with rubber spatula until just combined.

Scoop biscuit batter (approximately 2 1/2 tablespoons per biscuit) and drop on prepared baking sheet, spacing biscuits at least 2 inches apart.

Sprinkle the tops of each biscuit with turbinado sugar.

Place the baking sheet in the oven, on the middle rack, and bake 12 to 15 minutes, until the biscuit tops are golden brown.

Remove from the oven and let the biscuits cool for 5 minutes on the baking sheet. Transfer biscuits to wire rack and let them cool completely.

While the biscuits are cooling, make the lemon glaze, by whisking together the powdered sugar, lemon juice, and zest until smooth.

Drizzle the glaze over the cooled biscuits and serve. Enjoy.