Boil the potatoes and eggs separately.
Also pre-boil the chicken breast.
Wash the vegetables and herbs.
Chop spinach, mint and other herbs.
Mix all the ingredients and season with salt and pepper to taste.
In a separate bowl, put the required amount of mixed ingredients and season with yogurt with boiled cold water + sour cream to taste. And also add mustard, salt, pepper to taste.
If it seems that the acid is not enough, you can add lemon juice or a little acid.