Arrange the eggplants slices as single layer on a baking tray.
Sprinkle a little salt on top of all the slices and keep aside for 10 minutes.
Then, flip the slices and repeat the process.
Rinse the eggplant slices with water and dry them gently with paper towels.
In a small mixing bowl, add ricotta cheese, garlic, salt, pepper, Italian seasoning, parmesan cheese, mozzarella cheese, egg and mix until combined.
Spray the slow cooker (6 quart or larger) with oil.
Add about 1 cup marinara sauce and spread it out evenly, using the back of a spoon.
Add a single layer of broken lasagna noodles.
Spread half the ricotta cheese mixture as evenly as possible on top of the noodles.
Top it off with a layer of eggplant slices. It's okay if they overlap.
Add 1 cup marinara sauce and spread it out as evenly as you can.
Add another layer of broken lasagna noodles.
Add remaining ricotta cheese mixture and spread it out.
Sprinkle 1/4 cup of the mozzarella cheese and 1/4 cup of the parmesan cheese.
Add another layer of eggplant slices.
Add 1 cup of marinara sauce and spread it out as evenly as you can.
Sprinkle another 1/4 cup of the mozzarella cheese and 1/4 cup of the parmesan cheese.
Add another layer of broken lasagna noodles.
Add final 1 cup marinara sauce and spread it out as evenly as you can.
Cook on High heat for 2 to 2.5 hours or on Low heat for 4-5 hours or until noodles are softened and cooked through. In the final 15-20 minutes, sprinkle the remaining mozzarella cheese and parmesan cheese.
Cover and let it continue cooking until cheese is fully melted.
Garnish with roughly chopped fresh parsley or basil. Enjoy!