Start by laying the chicken thighs in the bottom of the slow cooker. Spread over the barbecue sauce. Sprinkle over the brown sugar, red pepper flakes, black pepper, garlic and cilantro over the chicken and barbecue sauce. Pour over the Italian dressing.
Cover and cook on HIGH for 4 hours. Don't open the lid during the cooking time.
After the cooking time is up. Add the sugar snap peas and squash.
Cover the slow cooker again, and cook for an additional hour on HIGH.