Cookwith - Vegetarian Spinach Lasagna with Ricotta and Basil

Ingredients

• 9 lasagna noodles (regular or oven-ready)
• 2 tbsp olive oil
• 1 medium yellow onion, diced
• 3 cloves garlic, minced
• 4 cups fresh spinach (or 10 oz frozen, thawed and squeezed dry)
• 1 tsp dried oregano
• 1/2 tsp red pepper flakes (optional)
• 1/2 tsp salt, more to taste
• Freshly ground black pepper, to taste
• 1 (28 oz) can DOP-certified whole tomatoes, crushed by hand or with a potato masher
• 1 cup ricotta cheese
• 1 large egg
• 1/2 cup grated Parmigiano Reggiano cheese
• 1 1/2 cups shredded mozzarella cheese
• 1/2 cup fresh basil leaves, chopped, plus extra for garnish