Preheat Oven Set oven to 350°F (175°C) and grease a loaf pan.
Mix Dry Ingredients Combine flour, baking powder, and salt in a bowl.
Cream Butter & Sugar Beat together butter and sugar until light and fluffy.
Add Eggs & Lemon Mix in eggs, lemon zest, and lemon juice.
Combine Wet & Dry Gradually add dry ingredients to the wet mixture.
Fold in Blueberries Gently fold in fresh or frozen blueberries.
Pour Batter Pour batter into the prepared loaf pan.
Bake & Cool Bake for 50-60 minutes; let cool before slicing.
Serve & Enjoy Slice and enjoy with a dusting of powdered sugar or a glaze.