Place the prepared chicken into a bowl with the salt and ground black pepper. Toss to coat well.
Add the cornstarch and toss until all of the chicken is well coated. Set aside until ready to fry.
In a smaller bowl, whisk together soy sauce, water, brown sugar, and garlic. Set aside.
Slice the jalapenos into ¼ inch slices. Remove seeds for milder flavor if preferred.
Add 4 inches of vegetable oil to a heavy-bottomed pot. Heat to 315°F.
Fry the chicken in batches (4–5 pieces at a time) for 5–6 minutes, turning at halfway mark. Drain.
Increase the oil heat to 350°F. Refry all chicken for another 3–4 minutes to crisp. Drain well.
In a large skillet, over medium-high heat, boil the sauce mixture.
Add the fried chicken and sliced jalapenos to skillet. Toss well and cook until sauce thickens and water evaporates.
Garnish and serve immediately over rice or noodles.
Notes
Want it less spicy? Remove the seeds from the jalapenos. For extra crispness, don’t skip the second fry. Use chicken breast if preferred but watch cook time closely.