Empty the container of yogurt into a bowl along with the sugar and eggs, and beat vigorously.

Add the container of vegetable oil and the 3 containers of flour.

Mix vigorously, let it rest, and add the previously sifted baking powder.

While the mixture rests, peel and slice the 2 apples and sprinkle with lemon juice.

Transfer the batter into a cake pan, decorate with the apple slices, and sprinkle a little granulated sugar on top.

Bake at 350°F (180°C) for 30-40 minutes. Always do the toothpick test! Decorate with powdered sugar if desired.