Preheat the Oven:
Preheat your oven to 350°F (175°C). Grease a 9-inch (23cm) round cake pan and line the bottom with parchment paper.
Mix Wet Ingredients:
In a large bowl, whisk together the olive oil, sugar, eggs, lemon zest, lemon juice, and milk until smooth and well combined.
Combine Dry Ingredients:
In a separate bowl, sift together the flour, baking powder, and salt.
Combine Wet and Dry Ingredients:
Gradually add the dry ingredients to the wet ingredients, stirring gently until just combined. Avoid overmixing to keep the cake light and airy.
Bake the Cake:
Pour the batter into the prepared cake pan and smooth the top with a spatula. Bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
Cool and Serve:
Allow the cake to cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely. Dust with powdered sugar before serving, if desired.