Place 1 cup of sauce in the bottom of your 6 quart slow cooker.
Place first layer of noodles and top with 1/3 of ricotta cheese, 1 cup of sauce, 1/3 of sausage, 1/3 of mushrooms and 1/4 of mozzarella.
Repeat layers until out of ricotta, sausage and mushrooms.
Top with noodles then pour all remaining sauce over top and cover with remaining mozzarella and parmesan cheese.
Cover and cook on high for 4 hours.
If time allows, for best flavor, refrigerate overnight before slicing and reheating to serve.
Notes
Keep the lid on it. It may look like a lot of of liquid at first , especially for a slow cooker. But those dry noodles will absorb all that liquid and they need all that steam and liquid to cook. So don't "check on it" to death ;).
When placing dry noodles start in the center and place longwise, slightly overlapping until you get to the sides. When you get to smaller side spots, break noodles to fit. Don't worry if there are spaces without noodles. Just try your best to place noodles. It will all work out in the end.
If one side of your slow cooker cooks hotter than another, rotate your crock throughout cooking to make it cook more evenly.
If time allows, crock your lasagna over night OR the day before and let it refrigerate before cutting and reheating. It sets up so nicely after some resting time in the fridge and the flavors just blend so much better by the next day.
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As with any of our recipes, carb counts, calorie counts and nutritional information varies greatly. As a result, your nutritional content depends on which products you choose to use when cooking this dish. The auto-calculation is just an automated estimate and should NOT be used for specific dietary needs.
All slow cookers cook differently, so cooking times are always a basic guideline. Recipes should always be tested first in your own slow cooker and time adjusted as needed.