Slice off the ends of the zucchini and cut in half lengthwise.
Use a spoon to remove the flesh of the zucchini. Chop the flesh and set aside.
Place zucchini boats on a baking sheet and drizzle with 1 t olive oil. Season lightly with salt and pepper. Bake for 20 minutes.
Heat 1 tablespoon olive oil in a medium skillet over medium heat. Add the ground chicken or diced chicken breasts and cook until browned.
Add the Italian seasoning, garlic, zucchini flesh, salt and pepper. Cook an additional 2-3 minutes. Add spaghetti sauce and mix well.
Spoon some of the chicken mixture into each zucchini boat. Top each zucchini boat with more spaghetti sauce. Top with the mozzarella and a sprinkle of Parmesan.
Bake until the cheese is bubbly and golden brown, an additional 15- 20 minutes.