Mix together starter with flour, yogurt, brown sugar and water. Let sit at room temperature overnight.

Separate the egg. Whisk the egg white until frothy. Add the egg yolk, oil, salt, vanilla, lemon zest, and lemon juice. Add the starter mixture and baking soda, mixing just until combined. Stir in the fresh blueberries.

Preheat your waffle maker. Pour waffle batter and cook until golden brown. Repeat with remaining batter. Serve immediately.