Using the large setting, grate the squashes, and squeeze as much liquid out of them as possible.
Dice the onion into small pieces.
In a skillet, add the olive oil and sauté the onion, push to the sides of the skillet and add the zucchini. Sauté for 3-4 minutes.
Use a rectangular baking dish and spray it with olive oil. Add the sauted veggies.
Into a bowl add the egg whites, eggs, cottage cheese, salt and pepper and mix until evenly distributed.
Add to the baking dish and sprinkle on top with the mozzarella cheese.
Bake at 375° for 40 minutes or until golden brown on top.
Let cool and divide into portions.