In germany “Magerquark” is extremely essential in fitness/bodybuilding since its extremely lean and a package of 500g(65g protein) is like 1,5€ MAX.
Its also really good for digestion and contains good amount of minerals.
In its pure form its not the most delicious but its def. edible by just adding some fruits.
Greek yogurt/Skyr. There are different versions but if you find a decent one it’s pretty much the same thing nutritional value, and price wise. Personally, I think it’s nicer cus the texture is creamier than quark, without having more fat. Quark has this weird, kinda dry feel to it. Unless you get the fattier versions that is.