The Best Turkey Lasagna

Name: The Best Turkey Lasagna
Ingredients: 15 dried lasagna noodles (not no-boil, about 2/3 of a 1-pound box); 1 medium yellow onion; 1/4 cup loosely packed fresh parsley leaves, plus more for garnish; 12 ounces low-moisture whole milk or part-skim mozzarella cheese, shredded (about 3 cups); 2 ounces Parmesan cheese, finely grated (about 1 firmly packed cup grated on a Microplane or 2/3 cup store-bought); 2 tablespoons olive oil; 1 pound ground turkey (93% lean / 7% fat); 3/4 teaspoon kosher salt, divided; 1/2 teaspoon freshly ground black pepper, divided; 1 (15 to 16-ounce) container whole milk ricotta cheese (about 2 cups); 1 (32-ounce) jar marinara sauce (3 1/2 cups), such as Rao's