Prep: Preheat oven to 350°F (175°C). Grease the cake pan and line with parchment paper.
Dry Mix: Whisk flour, baking powder, and salt in a bowl. Set aside.
Cream Butter & Sugar: Beat butter and sugar until fluffy (~3 mins). Add eggs one at a time.
Zest & Juice: Mix in lemon zest and juice.
Combine: Alternately add dry mix and milk, starting/ending with flour.
Bake: Pour batter into pan. Bake 30-35 mins (toothpick clean). Cool 10 mins in pan, then transfer.
Glaze: Whisk powdered sugar and lemon juice. Drizzle over cooled cake.