I found this recipe in the Fix it and Forget it Cook Book when we first got married and have adapted it to our taste (including gluten free) over the years. It's super easy once you get the ground beef browned and it tastes great!
Slow Cooker Gluten Free Lasagna
1 pound ground beef
1 medium onion, chopped
1 tsp Italian seasoning
1/2 teaspoon garlic powder
salt and pepper to taste
28 oz jar of spaghetti sauce
15 ounce container of ricotta cheese
2 cups mozzarella cheese, shredded
1/2 cup water
8 gluten free lasagna noodles, uncooked (I use Tinkyada brown rice lasagna noodles)
Place the ground beef and chopped onion in a large skillet over medium heat. As the meat is browning, add the Italian seasoning and garlic powder. Continue cooking until meat is browned and onions are tender. Add salt and pepper to taste.
Break noodles to fit slow cooker. Place half in the bottom of a greased slow cooker. Spread half of cooked ground beef over the noodles. Layer half of the spaghetti sauce, half of the water, half of the ricotta cheese and half of the mozzarella cheese over the beef. Repeat layers.
Cover and cook on LOW 4-5 hours.