Zucchini Lasagna

Name: Zucchini Lasagna
Ingredients: 3 large zucchini (about 1 1/2 pounds); 1 3/4 tsp. kosher salt; 2 tbsp. olive oil; 1 (20-ounce) package cremini mushrooms, sliced; 2 garlic cloves, minced; 3/4 tsp. ground black pepper; 15 oz. spinach, rinsed and drained; 3 c. cottage cheese; 2 tbsp. flat-leaf parsley, finely chopped; 6 fresh basil leaves, cut in chiffonade (about 1 tablespoon); 2 large eggs, beaten; 1 c. freshly grated parmesan cheese (about 4 ounces); 1 (32-ounce) jar store-bought marinara sauce; 1 lb. shredded low-moisture mozzarella (about 4 cups)