Preheat oven to 425.

In a medium bowl, combine ricotta cheese, egg whites, garlic, oregano, basil, 1/8 tsp. salt, and 1/8 tsp. black pepper. Stir well and set aside.

Slice zucchini in half widthwise, and then slice each half lengthwise into 1/4-inch thick strips. 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. Add spinach and cook until spinach has wilted and excess moisture has evaporated, about 2 more minutes.

Remove skillet from heat and let cool. Blot away excess moisture from veggies, using paper towels. Transfer contents to the bowl of ricotta mixture and set aside.

Re-spray skillet and return to medium-high heat. Working in batches, cook zucchini until softened, about 2 minutes per side; remove skillet from heat and re-spray between batches. Set zucchini aside.

To make the sauce, in a microwave-safe bowl, combine sour cream with cheese wedges, breaking cheese wedges into pieces as you add them. Stir in 2 tbsp. Parm-style topping, remaining 1/8 tsp. salt, and remaining 1/8 tsp. black pepper. Microwave for 30 -45 seconds, until very warm. Stir until smooth and set aside.

Spray an 8" X 8" baking pan with nonstick spray. Evenly place 1/3rd of the cooked zucchini strips on the bottom. With a spoon or spatula, spread half of the ricotta-veggie mixture on top. Evenly top with 2 lasagna sheets, followed by 1/3rd of the sauce.

Repeat layering with the same amounts of zucchini, ricotta-veggie mixture, lasagna sheets, and sauce. Evenly top with remaining zucchini, followed by remaining sauce. Sprinkle with mozzarella and remaining 2 tbsp. Parm-style grated topping.

Bake in the oven for 25 -30 minutes, until cheese starts to brown.