Peel eggplant and cut into ⅓ inch rounds. Layer in a colander, sprinkling each layer with salt. Allow to sit for 30 minutes and then pat dry. (If you aren’t a fan of salt you can rinse and pat.)
Spread ½ cup of sauce in the bottom of the slow cooker.
Whisk together the eggs and milk in a shallow bowl. Stir together breadcrumbs, Parmesan cheese and Italian seasoning in a separate bowl. Dip eggplant in egg mixture and then in the breadcrumbs.
Layer ⅓ of the slices in the slow cooker. Top with 1 cup sauce and mozzarella cheese. Repeat layers two more times. Cook on low for eight hours.