Start by seasoning the chicken pieces with salt and black pepper. Toss them in a mixing bowl, making sure they’re evenly coated with seasoning. Next, add the cornstarch and toss again until each piece is covered. This cornstarch coating will crisp up beautifully when fried.
To make the sauce, whisk together the soy sauce, water, brown sugar, and minced garlic in a small bowl. Set this aside. If you love vibrant flavors, you can even add a pinch of chili flakes here for an extra layer of heat.
Slice the jalapenos into even, circular pieces. For a milder dish, remove the seeds. Fry these slices briefly in hot oil to caramelize their flavor and set them aside on a paper towel until needed.
Heat your heavy-bottomed pot with about four inches of oil to 315°F. Fry the chicken in batches, ensuring not to overcrowd the pot. Each batch should cook for 5–6 minutes until golden brown. Once finished, drain the chicken on a wire rack or paper towels. For an extra crunch, fry them a second time at 350°F for 3–4 minutes.
Heat a large skillet over medium-high heat and pour in your prepared sauce. Once it begins to simmer, add the fried chicken and jalapenos. Stir everything together, ensuring every piece of chicken is well-coated in the thickened sauce. Serve hot and enjoy!