Preheat oven to 350° F. Coat nonstick loaf pan with cooking spray and dust with flour. Shake excess out of pan.
Zest lemons using box grater or zester. Set aside.
Juice lemons. Set juice aside.
Place flour, baking powder, and salt in small bowl. Whisk to blend. Set aside.
Place sugar and 1 Tbsp. of lemon zest in large bowl. Work zest and sugar together with your hands until sugar is moist and fragrant.
Add Greek yogurt, vegetable oil, eggs, vanilla extract, and lemon juice to large bowl with sugar mixture. Whisk to combine until no lumps remain. Stir in fresh blueberries.
Add flour mixture to yogurt mixture and stir gently to combine.
Pour batter into prepared loaf pan. Bake for 50-55 minutes or until a knife or toothpick inserted into the center of the loaf comes out clean.
Remove from oven and place on a wire rack. Let cool for 10 minutes. Flip pan over and remove loaf. Let cool completely before adding lemon glaze.
Lemon Glaze
Whisk powdered sugar, lemon zest, lemon juice, melted butter, and salt in large bowl until combined. Place in fridge until no longer runny.
When the lemon blueberry bread has cooled, drizzle glaze over the top.