Preheat the oven to 350 degrees F (176 degrees C). Line an 8x4 (or 9x5) loaf pan with parchment paper, with the paper hanging over at least the two long sides.
Mix together the wet ingredients in a large mixing bowl. Set aside. Mix together the dry ingredients in a separate bowl. Pour dry ingredients into the large bowl of wet ingredients, using a spatula or whisk to stir.
Coat the blueberries in a tablespoon of flour. Then, add the blueberries to the batter and fold in the blueberries with a spatula.
Bake the bread for 40 minutes uncovered first. Then, tent with foil and bake another 10-15 minutes, or until a toothpick comes out clean.
Let the lemon blueberry bread rest in the loaf pan for 20 minutes. Then, gently remove it from the loaf pan and place it on a wire rack to cool completely.
If adding lemon glaze on top: Whisk together the ingredients for the lemon glaze. Then, pour it evenly on top of the bread. Allow the bread to rest for 5 minutes for the glaze to set.
Slice and enjoy!