Submerge the cucumber, carrots, and onion in a bowl with vinegar. Mix well and let sit for 20 minutes. Drain well before using.
Season the chicken with the seasoning rub. Heat a nonstick pan on medium heat. Once hot, add the oil. Saute the chicken golden brown on all sides to an internal temperature of 160 degrees using a thermometer. Then set aside.
Lightly toast the bread.
Layer the bread with lettuce, tomato, chicken, and pickled vegetables. Drizzle with sweet chili sauce. Garnish with cilantro and jalapeno. Serve with pickle.