01 - Set oven to 400°F.
02 - Wash and halve zucchinis lengthwise. Scoop out centers using a spoon to create boats, retaining about 1/4 inch shell thickness. Finely chop reserved zucchini flesh.
03 - Heat olive oil in large skillet over medium heat. Cook onion until translucent, about 3 minutes, then add garlic and cook 1 more minute.
04 - Add chopped zucchini flesh and cherry tomatoes to skillet. Sauté 3 to 4 minutes until softened.
05 - Stir in cooked chicken, dried Italian herbs, salt, and pepper. Cook for 2 additional minutes, then remove from heat and let cool briefly.
06 - Incorporate half of the shredded mozzarella and all the Parmesan cheese into the mixture.
07 - Arrange zucchini boats in baking dish, fill with chicken mixture, and top with remaining mozzarella cheese.
08 - Bake for 20 to 25 minutes until zucchinis are tender and cheese is melted and golden.
09 - Sprinkle fresh parsley over zucchinis before serving.