Preheat oven to 350 degrees F. Spray a bread pan with non stick cooking spray and set aside.
Add flour, baking powder, and salt into a mixing bowl. Whisk together and set aside.
In a stand mixer or with a hand mixer cream together butter and sugar. Add in lemon zest and eggs and mix again.
Add in the flour mix to your butter mix. Add a little at a time alternate between flour and buttermilk until all ingredients are well combined.
Fold in blueberries and pour batter into the prepared bread pans Bake for 60-65 minutes. Or until bread is fully cooked and a tooth pick could come out clean.
While bread bakes prepare glaze by whisking all ingredients together.
Once bread is baked remove it from the oven and place on a wire wrack. Pour glaze over and allow to cool until glaze has set. Serve and enjoy.