In a large skillet, brown 1 lb ground beef completely and drain off any remaining fat.
Stir in 3 cans crushed tomatoes (15 oz each), 1 tablespoon Italian seasoning, and 1 tablespoon garlic salt until well combined.
In a 6 quart crock pot, cover the bottom with some of the sauce.
Add a layer of the 1 bag frozen cheese ravioli (25 oz) over the sauce, then top with some of the 4 cups mozzarella cheese.
Continue layering the remaining meat sauce, the remaining ravioli, and more of the mozzarella cheese until all of the meat sauce and ravioli are used, making sure the top layer is meat sauce.
Sprinkle the remaining mozzarella cheese and ¼ cup parmesan cheese over the top.
Cook on low for 3-4 hours.
Turn off and let it sit for about 15 minutes before you serve. Cut and serve. Serve with your favorite side salad and crusty garlic bread.
Video
Notes
Expert Tips
Ground Beef - We cooked out ground beef in a separate skillet. But if you are looking for a slow cooker to cook your ground beef, check out these Best Slow Cookers of 2024.
Layering Ingredients - Make sure to layer the ingredients completely on all sides of the slow cooker. Then ensures that every bite is loaded with all the simple ingredients for the best lasagna recipe.
Rest Lasagna - It is important to let the lasagna rest after cooking. This allows all the layers to come together for the best flavor.
Variations Ideas
Ravioli - Frozen ravioli works best with this recipe. We used the cheese filled ravioli but you can use other kinds. Try the spinach and cheese filled or the sausage and cheese filled. I think they both would add in so much flavor.
Try Ground Sausage - We typically use ground beef in this recipe. But if I have some Italian Sausage or even breakfast sausage, I will add this to my ground beef. We love the extra flavor it brings.
Frozen Meatballs - We also have added frozen meatballs to this crockpot.
Spaghetti Sauce - Instead of Crushed tomatoes, you can use a jar of spaghetti sauce or tomato sauce. We like to use tomato basil sauce or roasted garlic. Any flavor will work.
Add in some onion and garlic to add some more flavor. I like adding them to my meat when I am cooking it.
Spinach - To sneak in those veggies, add in some fresh spinach with sauce. We love the flavor it gives and spinach has so many health benefits.
Ground Turkey - You can use ground turkey instead of ground beef if you prefer. I usually mix the two together if I want to add in some ground turkey.