Easy Spinach Lasagna Recipe - How to Make Vegetarian Spinach Lasagna

Ingredients

• 1 box lasagna noodles
• 1 large onion, chopped
• 3 cloves garlic, minced
• kosher salt
• Freshly ground black pepper
• 1 tsp. dried oregano
• 2 packages frozen spinach, thawed and drained of excess liquid
• 3 c. ricotta
• 1 large egg
• 1/2 c. Parmesan
• 1/2 tsp. ground cinnamon
• 3 c. mozzarella
• 2 c. marinara
• Freshly chopped parsley, for garnish