Make pesto: blend cilantro, cashews, jalapeño, garlic, lime juice, oil, water, salt, and pepper until smooth.
Mix pesto with chicken, tomatoes, and ½ cup mozzarella. Scoop out zucchini centers, brush with oil, season, and fill with mixture. Top with remaining cheese.
Cover with foil and bake for 35-45 minutes until zucchini is tender and cheese melts. Garnish with cilantro, cherry tomatoes, and drizzle with balsamic glaze before serving.
Notes
For best flavor, use fresh cilantro and high-quality cheese.