Set oven to 375F.
Slice sweet potato using a mandolin or sharp knife and separately chop up tomatoes, onions and mushrooms.
Mix cottage cheese with egg white and set aside.
Sauté red onions with garlic paste, then add meat, tomatoes, cilantro, mushrooms, tomato sauce, Italian seasoning.
Build lasagna. Add sweet potato slices, meat sauce, cottage cheese and then repeat. Top with mozzarella.
Cover with aluminum foil and bake for 45 minutes at 375F.