01 -
Get your oven warmed up to 325°F (163°C). Grab a big baking dish and lightly coat it with oil.
02 -
Sprinkle salt and pepper on your chicken chunks. Roll them in cornstarch first, then dunk each piece in the whisked eggs until they're fully covered.
03 -
Pour the oil into a wide skillet and heat it up over medium-high. Toss in the chicken in small batches, cooking each side until golden, roughly 2-3 minutes per side. Don't worry about cooking them through just yet.
04 -
Grab a bowl and stir together the sugar, white vinegar, ketchup, soy sauce, and both garlic and onion powders until everything's well combined.
05 -
Put your half-cooked chicken in the greased baking dish. Drizzle all the sauce over the top so every piece gets covered. Let it bake uncovered for 1 hour, but don't forget to mix it around every 15 minutes so the sauce gets nice and thick.