Cook sausage and onion in 10-inch skillet over medium heat 6 to 8 minutes, stirring occasionally, until sausage is no longer pink; drain.
Stir in tomato sauce, basil and salt.
Mix the Ricotta, Parmesan, and 1 cup of the mozzarella cheese together in a bowl. (Refrigerate remaining mozzarella cheese while lasagna cooks.)
Spoon one-fourth of the sausage mixture into 6-quart slow cooker; top with 5 noodles, broken into pieces to fit.
Spread with half of the cheese mixture and one-fourth of the sausage mixture.
Top with 5 noodles, remaining cheese mixture and one-fourth of the sausage mixture.
Top with remaining 5 noodles and remaining sausage mixture.
Cover and cook on Low heat setting 4 to 6 hours or until noodles are tender. Sprinkle top of lasagna with remaining 1 cup mozzarella cheese.
Cover and let stand about 10 minutes or until cheese is melted. Cut into pieces and serve.
Here are a few of my own little notes.
- In my crock pot it is always ready at 4 hours. If you go a lot longer than that, the bottom and sides can get over cooked. I'm sure different crock pots will vary.
- I've cooked it with cottage cheese instead before and it is pretty good. However I've found that depending on brand and sales, I can find Ricotta cheese cheaper, and it does taste better.
- I've had trouble finding Italian style tomato sauce, so I just add Italian seasoning to regular tomato sauce
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