01 - Set oven temperature to 400°F and allow it to fully preheat.
02 - Wash zucchinis and halve them lengthwise. Scoop out the inner flesh with a spoon, maintaining a 1/4-inch thick shell. Finely chop the reserved flesh.
03 - Heat olive oil in a large skillet over medium heat. Cook onion until translucent, approximately 3 minutes. Add garlic and sauté for an additional minute.
04 - Add reserved chopped zucchini flesh and cherry tomatoes to the skillet. Sauté for 3 to 4 minutes until softened.
05 - Incorporate shredded chicken, dried Italian herbs, salt, and pepper. Cook for 2 more minutes. Remove from heat and allow to cool slightly.
06 - Mix in half of the shredded mozzarella and all of the grated Parmesan cheese into the filling mixture.
07 - Place zucchini shells into a baking dish and fill each with the prepared chicken mixture. Top with remaining mozzarella cheese.
08 - Bake in the preheated oven for 20 to 25 minutes, until zucchinis are tender and cheese is melted and golden brown.
09 - Sprinkle chopped fresh parsley over the baked zucchini boats prior to serving.