• Begin by preheating your oven to 350°F (175°C). Prepare a 9-inch springform pan by greasing it lightly and lining the bottom with parchment paper to prevent sticking.

For Cake Preparation:

• In a mixing bowl, sift together the flour, potato starch, baking powder, and salt. Allow this dry mixture to rest for later use.
• In a separate large bowl or the bowl of your mixer, beat the softened butter and powdered sugar together until the mixture becomes pale and creamy, approximately 2 minutes with an electric mixer.
• Incorporate the egg yolks and whole eggs into the butter-sugar blend, mixing until well combined. Stir in the lemon zest and vanilla, blending gently until the mixture is uniform.
• Slowly fold the dry ingredients into the wet mixture using a rubber spatula. Mix just until fully combined, taking care not to overwork the batter, and scrape down the sides to ensure no flour remains.
• Evenly pour the batter into the prepared springform pan. Bake in the center of the oven for about 35 to 40 minutes, or until a toothpick inserted in the center comes out clean.
• After baking, let the cake cool in the pan on a wire rack for around 15 minutes. Carefully remove the springform collar and allow the cake to cool completely. Lightly dust the top with powdered sugar before serving for a charming presentation.