Start by slicing the zucchini into thin, even strips. Sprinkle with 1 teaspoon of salt and let sit for 15 minutes to draw out moisture.
In a large skillet, heat olive oil over medium heat. Add onion and sauté until translucent, about 3-4 minutes. Add garlic and cook for 1 minute. Add ground turkey, Italian seasoning, oregano, and pepper. Cook until turkey is browned, about 5-7 minutes. Stir in tomato sauce and crushed tomatoes, then remove from heat.
In a mixing bowl, combine ricotta cheese, egg yolk, and parsley. Mix until creamy and set aside.
Preheat oven to 375°F (190°C). Assemble the jars by layering zucchini, turkey mixture, ricotta mixture, and mozzarella. Repeat layers, finishing with zucchini, turkey, mozzarella, and Parmesan on top.
Place jars in a baking dish, adding water to the bottom for steam. Cover with aluminum foil and bake for 25 minutes. Remove foil and bake an additional 10-15 minutes until cheese is bubbly and golden.
Let the jars cool for a few minutes before serving. Enjoy directly from the jars!