I normally sautee onions in wine and add mushrooms until cooked. I then mix these with the spinach/cottage cheese mixture.
Layer the above mixture between precooked lasagne sheets and finish off with some lf white sauce & cheese (I use cottage cheese cos we can't get lf/ff cheese here in SA).
Bake until lasgane is cooked.
BTW, if you can get hold of butternut squash, then alternate layers of butternut* & the spinach/mushroom/cottage cheese mixture. It's absolutely YUMMY!!