Prepare the cake pan. Preheat oven to 350°F / 175°C. Coat a 9-inch round cake pan with nonstick baking spray, then line the bottom with parchment paper.
Whisk the dry ingredients. In a large mixing bowl, whisk together 2 cups (250g) cake flour, 1½ (300g) cups sugar, 1 tsp Kosher salt, 1 tsp baking powder, and ¼ tsp baking soda.
Whisk the wet ingredients. In a separate bowl, whisk together 1¼ cups extra virgin olive oil, 1¼ cups milk, 3 eggs, 1 Tbsp lemon zest, 2 Tbsp fresh lemon juice, and 1 tsp vanilla extract.
Combine wet and dry ingredients. Pour the dry ingredients into the wet, then whisk until just combined.
Bake the cake. Pour the cake batter into the prepared pan, then use a spatula to smooth out the top. Bake for 1 hour, or until the cake is golden on top and a cake tester inserted into the center of the cake comes out clean.
Cool the cake. Transfer to a wire rack and cool for 15 minutes. Run a knife around the edge of the pan, then invert the cake onto a plate, then back over onto the wire rack to cool fully, about 2 hours.
Dust with sugar, then serve. Lightly dust the cake with confectioner’s sugar, then slice and serve!