In Europe, low fat ricotta is almost impossible to obtain, so here's my solution:)
200 g of some kind of low fat cream cheese, the one I use has 14 g's protein, 3g fat and 4g grams
pr. 100 grams; 200 grams of non fat greek youghurt; 6 egg whites.
Stir the eggs in a bowl till they get stiff, add in half a cup of splenda, the zest of a whole lemon, and a good sprinkle of vanilla, mix it with the youghurt and cheese, so you get a homogenous mass, pour it in a fireproof dish and
bake it in an oven at 200 degrees celcius for 50 minutes.
The nutrient facts for my version would be 55 grams of protein, 6 grams of fat and 20-25 grams of carbs for the whole cake, enjoy:)!