Add the cooked spinach.
Place a layer of gluten-free lasagna noodles on top of the sauce.
Spoon half of the cheese mixture over the noodles.
Place another layer of lasagna noodles on top of the cheese mixture.
Spoon the remaining cheese mixture on top of the noodles.
Place another layer of lasagna noodles on top of the cheese mixture.
Spoon the remaining marinara sauce on top of the noodles.
Bake the lasagna for 35-40 minutes, or until the cheese is melted and the sauce is bubbly.
Let the lasagna cool for a few minutes before serving. Enjoy!