In a large skillet, heat olive oil over medium heat. Cook sausage, breaking into pieces, until browned (10-12 minutes).
Add spaghetti sauce and water, bring to simmer and turn heat off.
In smallish bowl, stir together ricotta, parsley, and salt and pepper.
Spread a layer of sauce in bottom of slow cooker insert. Cover with a layer of noodles (about 4) breaking them to fit and overlapping somewhat. Spread 1/3 of ricotta mixture on top. (Don’t worry too much about spreading the ricotta now, it will spread better when you add sauce). Spread 2 cups of sauce on top of ricotta. Sprinkle with about 1 cup mozzarella and 1/3 of Parmesan. Repeat layers 3 more times starting with noodles and finishing with a nice amount of mozzarella.
Cook on low in slow cooker for 4 hours.
Place slow cooker insert in oven and broil until cheese is bubbly and starting to brown. Let rest for 20 minutes and serve.
Notes
Ground beef can be used instead of Italian sausage.
How long does it take to cook lasagna in a slow cooker?
Since the meat is already cooked, it only takes about 4 hours on LOW heat to cook this lasagna. Keep in mind that cooking times vary between slow cookers. If your slow cooker runs hot, it will most likely be done in less than 4 hours.
Slow Cooker Lasagna Recipe Tips:
You will need a 6-quart slow cooker for this recipe.
You can use 2 pounds of ground beef instead of Italian sausage.
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