Chocolate Pan Cake

Whisk the egg with sugar until the mixture doubles in volume and turns pale.

Add the oil, then the yogurt, vinegar, and vanilla, and whisk again.

Sift the flour, cocoa, baking powder, and salt in two batches.

Gently fold the dry ingredients into the wet mixture using a silicone spatula, without overmixing.

Heat the pan, then lightly grease it with butter.

Pour the batter into the pan and cover it.

Cook on low heat until the cake is fully baked, then check doneness using a wooden skewer.

Make small holes in the cake, then pour the chocolate sauce made from melted chocolate and cream (or milk) over it.