Rince the fresh herbs, cut off the damaged ends of the stems and dry them with a clean cloth.
With a large knife, finely chop the parsley, coriander and dill (chop the parsley, coriander and dill several times).
Then chop the onions and some of the "green", as well as the garlic if you use it.
Preheat the oven to 180°C.
Coarsely crush the walnut kernels.
In a bowl, beat the eggs vigorously to obtain a frothy mixture. Then add the yoghurt, baking powder, oil and possibly flour and mix again with a whisk.
Then add the spices and continue mixing.
Finally, add the herbs, barberries and nuts and mix with a spoon or spatula to distribute them well.
Pour the mixture into a buttered or oiled cake tin (or a tin covered with baking paper). You can use a larger or smaller pan depending on the thickness you wish to obtain.
Bake in the oven for about twenty minutes. Check the cooking with the blade of a knife: it should come out clean when you prick the centre of the "omelette".
Enjoy hot, warm or cold!