01 -
Preheat oven to 175°C. Grease and flour three 20 cm round cake pans, then line the bottoms with parchment paper.
02 -
In a large bowl, whisk together flour, sugar, cornstarch, baking powder, baking soda, and salt until evenly combined.
03 -
Using an electric mixer on low speed, add softened butter one piece at a time, blending fully until mixture resembles coarse sand.
04 -
Slowly drizzle in oil with mixer on low, mixing until just incorporated.
05 -
In a separate bowl, whisk buttermilk, lemon zest, lemon juice, eggs, and vanilla extract until smooth.
06 -
Gradually add wet mixture to dry ingredients while mixing on low speed. Mix until fully combined and smooth.
07 -
Toss blueberries with one tablespoon of flour to prevent sinking, then gently fold into batter with a spatula.
08 -
Evenly distribute batter into prepared pans. Bake for approximately 30 minutes or until tops spring back and a toothpick inserted comes out with moist crumbs.
09 -
Allow cakes to cool in pans 10-15 minutes. Run a knife around edges, invert onto wire racks, and cool completely.
10 -
Stack cake layers and apply lemon or cream cheese frosting. Decorate with blueberries, lemon slices, or dust with powdered sugar as desired.