1️⃣ Preheat the oven to 350°F (175°C). Grease and flour a 9×13 inch baking pan.
2️⃣ In a large bowl, cream together the butter and granulated sugar until light and fluffy.
3️⃣ Beat in the eggs, one at a time, then stir in the vanilla extract and lemon zest.
4️⃣ In a separate bowl, whisk together the flour, baking powder, baking soda, and salt.
5️⃣ Gradually add the dry ingredients to the butter mixture, alternating with the buttermilk. Mix well after each addition. Stir in the fresh lemon juice.
6️⃣ Pour the batter into the prepared baking pan and spread evenly.
7️⃣ Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Allow the cake to cool in the pan.
8️⃣ For the glaze, whisk together the powdered sugar and lemon juice until smooth. Drizzle over the cooled cake.