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Arrange chicken wings in the slow cooker.
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In a bowl, whisk together soy sauce, honey, ketchup, rice vinegar, garlic, ginger, and red pepper flakes. Pour over the wings and toss to coat evenly.
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Cover and cook on Low for 4–5 hours or High for 2–3 hours, until the wings are tender.
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Transfer the wings to a foil-lined baking sheet. Preheat the broiler.
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In a small bowl, mix cornstarch with water to form a slurry. Stir into the sauce remaining in the slow cooker and heat until thickened.
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Brush the thickened sauce generously over the wings.
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Broil for 3–5 minutes, until the edges are slightly charred and the glaze is sticky.
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Garnish with sesame seeds and chopped green onions before serving.
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For more heat: Add extra red pepper flakes or a dash of sriracha.
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Sweeter glaze: Increase the honey to taste.
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Flavor boost: Stir in 1 tablespoon of hoisin sauce or a splash of lime juice.
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Easy eating: Use chicken drumettes for more meat per piece.
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Gluten-free option: Substitute soy sauce with tamari.