Preheat oven to 180 °C (350°F) and grease a 9-inch spring form cake tin. Line the bottom with parchment paper as well.

Mix together flour, cornstarch, baking powder and salt and set aside.

In a large bowl add butter, vegetable oil, sugar and lemon zest. Using a hand or stand mixer on a medium speed, cream together for 2 minutes until light and creamy.

Add in the eggs one by one, mixing well in between each addition.

Add in yogurt, lemon juice and vanilla. Mix until well combined. Now set your mixer aside as the remainder of the batter will be finished by hand.

Add your pre-mixed dry ingredients to your wet mixture, and using a spatula, fold together until just combined. Do not over mix.

Toss half of the blueberries in a tablespoon of flour (this will prevent them from sinking to the bottom of the cake) and then add the coated blueberries to the batter and fold them in with a spatula until just combined. Do not over mix.

Distribute the batter evenly into the prepared cake pan. Scatter the remaining half of the blueberries evenly across the top of the cake. Drop the cake tin lightly on the counter to remove any large air bubbles and bake for 40 minutes, or until a toothpick comes out clean or with a few moist crumbs on it.

Allow the cake to cool in the tin for 20 minutes, before removing the outer ring of the spring form pan. Allow the cake to completely cool before removing the base and parchment paper.

Dust the top with powdered sugar and serve as is, or with a side of whipped cream or ice cream. Enjoy!