In a large skillet, combine Italian sausage, ground beef, chopped onion, and minced garlic. Sauté over medium heat until the meat is no longer pink and the onions are tender, about 7-10 minutes. Drain excess fat.
Stir in canned tomatoes, tomato paste, sugar, 1 teaspoon salt, basil, fennel, and black pepper. Bring to a boil, then reduce heat and simmer for 5 minutes.
In a medium bowl, mix ricotta cheese, beaten egg, parsley, and remaining salt.
In the crockpot, spoon 1 cup of the meat sauce into the bottom. Layer one-third of uncooked lasagna noodles over the sauce, followed by half of the ricotta mixture and 1 cup of shredded mozzarella cheese. Repeat the layers two more times.
Finish with a final layer of noodles topped with the remaining meat sauce. Reserve 1 cup of mozzarella for later.
Cover and cook on high for 2-3 hours or low for 5-6 hours. Add the reserved mozzarella cheese for the last 30 minutes of cooking.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 4 days, or freeze for up to 3 months.