Skillet Spinach Lasagna

Ingredients:

– 9 lasagna noodles
– 2 tablespoons olive oil
– 1 small onion, diced
– 3 cloves garlic, minced
– 5 cups fresh spinach, roughly chopped
– 1 teaspoon dried oregano
– 1 teaspoon dried basil
– Salt and pepper to taste
– 1 jar (24 oz) marinara sauce
– 15 oz ricotta cheese
– 1 cup shredded mozzarella cheese
– 1/2 cup grated Parmesan cheese
– Fresh basil leaves for garnish (optional)