Prep: Preheat oven to 350°F (175°C). Grease and flour a 9x5-inch loaf pan.
Dry Ingredients: Whisk flour, baking powder, and salt in a bowl. Set aside.
Cream Butter & Sugar: Beat butter and sugar until fluffy (2–3 mins). Add eggs one at a time, then mix in lemon zest and juice.
Combine: Alternate adding dry ingredients and buttermilk, mixing just until combined.
Bake: Pour batter into the pan. Bake 45–50 mins or until a toothpick comes out clean. Cool 10 mins in pan, then transfer to a rack.
Glaze: Whisk powdered sugar and lemon juice. Drizzle over cooled bread.