01 - Preheat the oven to 400°F.
02 - Wash zucchinis and slice each lengthwise. Scoop out centers with a spoon, leaving a 1/4-inch shell; chop reserved flesh finely.
03 - Heat olive oil in a large skillet over medium heat. Cook onion until translucent, about 3 minutes, then add garlic and cook 1 minute more.
04 - Add chopped zucchini flesh and cherry tomatoes to the skillet and sauté for 3 to 4 minutes until softened.
05 - Stir in cooked chicken, dried Italian herbs, salt, and pepper. Cook for 2 more minutes then remove from heat and let cool slightly.
06 - Mix in half of the mozzarella cheese and all of the Parmesan cheese into the filling.
07 - Arrange zucchini shells in a baking dish and fill each with the chicken mixture. 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 the baked boats before serving.