Preheat Oven: Preheat your oven to 375°F (190°C). Lightly grease a 9x13-inch baking dish.
Sauté Spinach: In a large skillet, heat olive oil over medium heat. Add the minced garlic and sauté for 1-2 minutes until fragrant. Add the chopped spinach and cook for 2-3 minutes until wilted. Remove from heat and let cool.
Prepare the Filling: In a large bowl, combine the ricotta cheese, Parmesan cheese, 1/2 cup shredded mozzarella, egg, Italian seasoning, salt, and pepper. Add the sautéed spinach and mix until well combined.
Assemble the Rolls: Lay the cooked lasagna noodles flat on a clean surface. Spread 2-3 tablespoons of the spinach-ricotta mixture evenly over each noodle.
Roll the Noodles: Carefully roll each noodle tightly and place seam-side down in the prepared baking dish.
Add Marinara Sauce: Pour the marinara sauce evenly over the lasagna rolls, ensuring all rolls are covered.
Top with Cheese: Sprinkle additional mozzarella cheese over the top for a gooey, cheesy finish.
Bake: Cover the dish with aluminum foil and bake for 20 minutes. Remove the foil and bake for an additional 10 minutes until the cheese is bubbly and golden.
Garnish and Serve: Garnish with fresh basil or parsley and serve hot.
Enjoy: Serve with a side salad and garlic bread for a complete meal.