1. Heat some oil in a pan for frying the bean threads. Fry for just a couple of seconds and remove immediately. Crumble them up just a bit.
2. Heat olive oil in a saucepan over medium high heat. Add ground chicken and cook until browned, about 3-5 minutes, making sure to crumble the chicken as it cooks; drain excess fat.
3. Stir in garlic, onion, Hoisin sauce, soy sauce, rice wine vinegar, ginger and Sriracha sauce until onions have become translucent, about 1-2 minutes. Stir in chestnuts and green onions until tender, about 1-2 minutes; season with salt and pepper, to taste.
4. Serve the chicken filling in cup-shaped lettuce leaves topped with the fried bean threads.