Preheat the oven to 400. Cut the zucchinis in half and scoop out all the seeds. Chop the onion into small pieces and add to a pan with olive oil and garlic over medium heat.
Cook for 4-5 minutes until onions are tender. Transfer to a large bowl and add chicken, cilantro, cheese, bbq sauce, cilantro, garlic salt, and black pepper.
Line a 9x13 pan with tin foil and spray with a bit of olive oil spray. Place zucchinis in pan, cut side up. Fill each zucchini, using up all the filling. Top with a little extra cheese.
Cover the pan with tin foil and bake for 30 minutes. Take the tin foil off and bake an additional 15 minutes. Let the boats cool for 5-10 minutes, then top with extra cilantro and enjoy!