Preheat oven to 375°F (190°C).
Sprinkle eggplant slices with salt and let rest for 20 minutes to remove moisture. Rinse and pat dry.
In a skillet, brown ground meat with minced garlic, salt, pepper, and Italian seasoning. Drain excess fat.
Stir marinara sauce into the cooked meat and remove from heat.
In a bowl, combine ricotta cheese, egg, and half of the Parmesan cheese until smooth.
Brush a baking dish with olive oil. Layer eggplant slices, half the meat sauce, half the ricotta mixture, and a layer of mozzarella cheese.
Repeat layering with remaining eggplant, meat sauce, ricotta mixture, and mozzarella. Top with remaining Parmesan cheese.
Cover dish with foil and bake for 30 minutes.
Remove foil and bake an additional 15 minutes until cheese is bubbly and golden.
Let cool for a few minutes before slicing and serving.