Cook the frozen chicken pieces in an air fryer or oven until hot and crispy, about 10 minutes.
In a pan, combine ketchup, water, rice vinegar, soy sauce, sugar, chopped garlic, cornstarch, and red pepper flakes.
Cook the sauce mixture over medium heat, whisking constantly, until it bubbles and thickens, about 1.5 minutes.
Add the cooked crispy chicken to the pan and toss until completely coated in the sauce.
Serve the saucy chicken over leftover cooked rice and garnish with chopped green onions and sesame seeds.
Cook it hands-free.
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