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preheat oven to 400° and line a large baking sheet with foil. in a large bowl, toss chicken with barbecue sauce.
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layer half the chips, cheddar, cotija, chicken, pickled jalapeños, and onion.
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repeat.
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bake until cheese is melty and nachos warmed through, 15 minutes.
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top with avocado and cilantro before serving.