Comforting Creamy Spinach and Ricotta Lasagna

Ingredients

• 2 cups (300 g) fresh spinach, chopped
• 15 oz (425 g) ricotta cheese
• 1 cup (100 g) grated Parmesan cheese
• 1 large egg
• 1 teaspoon (5 g) salt
• 1/2 teaspoon (2 g) black pepper
• 1/4 teaspoon (1 g) ground nutmeg
• 1 clove garlic, minced (optional)
• 9-12 lasagna noodles (no-boil or regular)
• 3 cups (700 ml) marinara sauce
• 2 cups (200 g) shredded mozzarella cheese
• 1 tablespoon olive oil (for greasing the pan)