Preheat your oven to 375 degrees f.
Lightly spray a rectangle baking dish with avocado oil and line a large, flat baking sheet with parchment paper. I used a STAUB Ceramic Rectangular Baking Dish 11" X 8" for this recipe. If you'd like to double this recipe up, I'd recommend using a 13" × 9".
Arrange your zucchini slices onto your prepared flat bakkng sheet, without overlapping. Sprinkle zucchini with sea salt and pepper.
Bake zucchini in your preheated oven for 8-10 minutes; Depending on their thickness, the slices should become slightly tender and release most of the moisture.
Once the zucchini slices are ready, use a paper towel to pat them dry and absorb as much moisture as possible.
Heat a large skillet over medium heat and spray with a touch of oil.
Add in your ground meat and cook, breaking up the meat with a wooden spatula, for about 6-8 minutes.
Stir in the marinara sauce, garlic and seasonings. Allow sauce to simmer over medium-low heat until thickened, about 15 minutes.
Meanwhile, in a small bowl, combine the ricotta, 2/3 cup of shredded mozzarella, the egg and chopped fresh basil. Season with a pinch of sea salt and pepper and stir well to combine.
To assemble your lasagna, spread a big spoonful of meat sauce onto the bottom of your baking dish.
Arrange a layer of zucchini slices evenly over the sauce, and top them with a thin layer of cheese mixture. Continue with a layer of meat sauce, then zucchini, then cheese; alternating so on - until all your ingredients are assembled.
Sprinkle the top with remaining mozzarella cheese.
Bake in your preheated oven until bubbly and melty, for about 20-25 minutes.
Garnish with additional fresh basil if desired, then serve.