Super Fast Classic Lasagna

Name: Super-Fast Classic Lasagna
Ingredients: 8 lasagna noodles; 2 tablespoons extra-virgin olive oil; 1 medium onion, chopped; 3 garlic cloves, minced; 1 pound ground beef; 1 1/2 cups store-bought marinara sauce; 1/2 teaspoon balsamic vinegar; 1/2 teaspoon oregano; Sea salt; Freshly ground pepper; 15 ounces ricotta cheese (1 1/2 cups); 1 large egg; 1/2 teaspoon freshly grated nutmeg; 4 ounces fresh mozzarella cheese, pulled into small pieces (1 cup); 8 ounces Parmigiano-Reggiano cheese, grated (2 cups)