Preheat the oven to 375°F (190°C).
In a large pot of salted water, bring to a boil and cook the gluten-free lasagna noodles according to package instructions. Drain and set aside.
In a skillet over medium heat, add olive oil and sauté minced garlic for about 1-2 minutes until fragrant. Add fresh spinach and cook until wilted. Remove from heat.
In a large mixing bowl, combine shredded chicken, cooked spinach, ricotta cheese, Italian seasoning, salt, and pepper. Mix until well combined.
To assemble the lasagna, spread a thin layer of marinara sauce at the bottom of the 9x13 inch baking dish. Place 3 gluten-free noodles on top.
Spread half of the chicken and spinach mixture over the noodles, followed by a third of the mozzarella cheese and a sprinkle of Parmesan cheese.
Repeat the layers (sauce, noodles, chicken mixture, mozzarella, and Parmesan) one more time.
For the final layer, place the remaining 3 noodles, top with the rest of the marinara sauce, remaining mozzarella, and Parmesan cheese.
Cover the baking dish with aluminum foil and bake for 30 minutes. Remove the foil and bake for an additional 15 minutes, or until the cheese is bubbling and golden.
Let the lasagna rest for 10 minutes before slicing and serving.