Coat chicken pieces in cornstarch, dip in beaten egg, and fry until golden brown.
Remove from oil and drain on a paper towel.
In a wok, heat a little oil, then stir-fry garlic, bell peppers, and pineapple.
Mix soy sauce, rice vinegar, ketchup, brown sugar, salt, and pepper in a bowl.
Pour sauce into the wok, letting it thicken.
Toss in chicken and stir until fully coated.
Serve immediately while questioning why you haven’t made this before.