In a large bowl, add the eggs, the vanilla essence, the refined sugar and beat everything very well with an electric mixer until it’s foamy.
Add the vegetable oil, the unsweetened natural yogurt and beat again to combine.
Next, add the sifted wheat flour and beat until smooth.
Add the baking powder and mix gently.
Transfer half of this batter to a 30cm diameter cake pan, greased with wheat flour and butter.
Then, add fruit jam all over the batter.
Now, using a barbecue stick, spread the jelly in circular motions.
Then, add the rest of the batter and spread it out evenly.
Add another 50g of jam and spread it again with a barbecue stick.
Take the dessert to a preheated oven at 180° C (350° F) and bake for 40 minutes.
To finish, sprinkle powdered sugar to taste over the entire cake.
Serve.