Preheat the oven to 375 degrees fahrenheit. Cook the gluten free lasagna noodles according to the package instructions, then drain and set aside.
In a large skillet over medium heat, brown the ground beef until fully cooked. Drain excess fat, then stir in the marinara sauce, italian seasoning, and salt. Simmer for 5 minutes.
In a medium bowl, mix the ricotta cheese, egg, and grated parmesan cheese until well combined.
In a 9x13 baking dish, spread a thin layer of meat sauce on the bottom. Layer with gluten free noodles, half of the ricotta mixture, more meat sauce, and a sprinkle of shredded mozzarella cheese.
Repeat the layers, finishing with noodles, the remaining meat sauce, and a heavy layer of shredded mozzarella cheese on top.
Cover loosely with foil and bake for 30 minutes. Remove the foil and bake for an additional 10 minutes until the cheese is golden and bubbly. Let rest for 10 minutes before slicing.