Preheat the oven to 425 degrees F.
Spritz both sides of each eggplant slice with nonstick spray and place on a baking sheet. Bake in the oven until browned and softened, about 20 minutes, carefully flipping halfway through.
Meanwhile, in a bowl, combine egg white(s), ricotta cheese, basil, garlic, salt, and nutmeg. Stir well and set aside.
Bring a skillet sprayed with nonstick spray to medium-high heat on the stove. Add mushrooms and, stirring occasionally, cook until softened, about 4 minutes. Stir mushrooms into ricotta mixture and set aside.
In a small bowl, combine Italian seasoning with crushed tomatoes. If you like, season with black pepper and additional salt, to taste. Mix well and set aside.
Spray a large loaf pan with nonstick spray. Pour 1/4 cup tomatoes evenly into the bottom of the pan. Top with 1 lasagna sheet. Spread half of the ricotta-mushroom mixture on top, followed by another 1/4 cup tomatoes. Top with 1 eggplant slice.
Repeat layering with 1/4 cup tomatoes, 1 lasagna sheet, the remaining ricotta-mushroom mixture, the remaining 1/4 cup tomatoes, and the remaining eggplant slice.
Evenly top with mozzarella and grated topping. Bake until the cheese starts to brown, 20 to 25 minutes. Serve and enjoy!
PER SERVING (12 of lasagna): 238 calories, 4g fat, 845mg sodium, 31.5g carbs, 5g fiber, 10g sugars, 17.5g protein