Pat the chicken dry. Season with black pepper and toss with cornstarch until evenly coated. Set aside.
Swap chicken for tofu or cauliflower to make it vegetarian.
Use arrowroot or potato starch as a cornstarch substitute if needed.
Heat avocado oil in a large skillet over medium-high heat. Add chicken in a single layer. Work in batches if necessary to avoid overcrowding. Cook for 6 to 8 minutes, turning occasionally, until golden and cooked through. Transfer to a plate.
In a small bowl, whisk together coconut aminos, sesame oil, brown sugar, garlic, ketchup, and rice vinegar. In a separate bowl, mix the cornstarch and water to create a slurry.
White vinegar or apple cider vinegar may be used in place of rice vinegar
Pour the sauce into the skillet and use a wooden spoon to scrape up any brown bits stuck to the pan. Bring to a simmer, then stir in the slurry. Cook for 1 to 2 minutes until the sauce thickens slightly and becomes glossy.
Return the cooked chicken to the skillet and toss to coat in the sauce. Let simmer for another 1 to 2 minutes until heated through.
Serve with rice and/or vegetables. Garnish with sesame seeds and green onions if desired. For a little heat, add crushed red pepper flakes to taste.
Video
Notes
Store leftovers in an airtight container in the fridge for up to 4 days.
Reheat gently on the stove with a splash of water to loosen the sauce.
For meal prep, store chicken and sauce separately and combine when ready to eat.