I generally use 3 eggs (well beaten to incorporate a bit of air) to one tub of cottage cheese and 56g of LF cheddar (2 x HexA cos I can eat it over 2 days) - I cram mine full of veggies that I've "fried" off first before I put everything into a big bowl and mix together, then pour it into a 7 or 8" square pyrex dish and top with sliced tomatoes. I bake on gas 4 (180) for 30-40 mins. Mine is always "set" and quite often it can be a little too well done but I don't mind this.
I have found that if I add a tub of quark to the mix I get a lovely cheesy flavour but the texture isn't the same - for want of a better word, I'd describe it as "bitty" in that it doesn't seem to bind together as good as it does when I don't add quark.