In a large skillet over medium heat, cook the Italian sausage, ground beef, onion, and garlic for 7-10 minutes until the meats are no longer pink. Drain excess fat.
Stir in the canned tomatoes, tomato paste, sugar, 1 teaspoon of salt, dried basil, fennel seed, and black pepper. Bring to a boil, then reduce heat and simmer for 5 minutes.
In a separate bowl, mix the ricotta cheese with the beaten egg, parsley, and the remaining teaspoon of salt and black pepper.
To layer, spoon about 1 cup of the meat sauce into the bottom of the crockpot. Lay one-third of the uncooked lasagna noodles over the sauce, followed by half of the ricotta mixture and 1 cup of mozzarella.
Repeat the layers two more times. For the top layer, add the remaining noodles and finish with the remaining meat sauce, topping it with the reserved mozzarella.
Cover and cook on high for 2-3 hours or on low for 5-6 hours, until hot and bubbly.
Once cooked, serve hot with a side salad or garlic bread.
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Notes
Store leftovers in an airtight container in the refrigerator for up to 3-4 days.