Beat the egg whites until stiff and set aside.
In a bowl, beat the yolks with the sugar, the oil, the yoghurt and the Mahón-Menorca cheese cut into cubes.
Add the flour mixed with the baking powder using a sieve and stir with a spatula. Fold in the egg whites in gentle, circular movements.
Pour the mixture into a mould and bake in a preheated oven at 180ºC for 40 minutes until a skewer comes out clean.
Put the berries, sugar and half a glass of water in a saucepan, heat to reduce and strain using a fine sieve.
Pour the berry coulis over the pieces of sponge.