Let’s get baking! This process is as much about the journey as it is the destination. Here’s how to bring this buttery delight to life:

1. Preheat your oven to 350°F (175°C) and grease a 9-inch round cake pan.
2. In a large bowl, cream together the softened butter and sugar until light and fluffy, about 3-4 minutes. This step is crucial for a tender cake crumb.
3. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
4. In a separate bowl, whisk together the flour, baking powder, and salt. Gradually add this to the butter mixture, alternating with the milk, starting and ending with the flour mix. Mix until just combined.
5. Gently fold in the lemon zest, if using. Pour the batter into the prepared pan and smooth the top.
6. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean. Your kitchen will fill with the most delightful aroma.
7. Allow the cake to cool in the pan for 10 minutes before transferring to a wire rack to cool completely. Patience is key here, though it’s always tempting to sneak a taste early!