1. In a skillet, cook the ground beef until browned. Drain excess fat.
2. Add marinara sauce to the skillet and mix with the cooked beef.
3. In a bowl, combine ricotta cheese, 1 cup of mozzarella cheese, Parmesan cheese, basil, oregano, and garlic powder. Mix well.
4. Spread a thin layer of the meat sauce at the bottom of the slow cooker.
5. Place a layer of uncooked gluten-free lasagna noodles over the sauce. Break noodles to fit as needed.
6. Spread a layer of the cheese mixture over the noodles.
7. Repeat the layers until all ingredients are used, ending with a layer of meat sauce.
8. Sprinkle the remaining 1 cup of mozzarella cheese on top.
9. Cover and cook on low for 4 hours or until noodles are tender.
10. Let it sit for 10 minutes before serving. Enjoy!