In a bowl, mix the chicken pieces with cornstarch, salt, and pepper to coat evenly.
Heat 2 tablespoons of vegetable oil in a large skillet or wok over medium-high heat. Add the coated chicken and sauté until golden brown, approximately 5-7 minutes. Remove the chicken from the skillet and set aside.
In the same skillet, add the remaining tablespoon of oil, then add the diced onion and garlic. Sauté until the onion becomes translucent (about 3 minutes).
Add the diced bell peppers and sugar snap peas to the skillet and continue to sauté for another 3-4 minutes until they start to soften.
Stir in the pineapple chunks and browned chicken pieces back into the skillet.
In a separate bowl, combine the ketchup, apple cider vinegar, soy sauce, and grated ginger. Mix well, then pour this sauce over the chicken and vegetables in the skillet.
Cook everything together, stirring occasionally, for an additional 3-4 minutes until the sauce thickens and fully coats the chicken and veggies.
Adjust seasoning with more salt and pepper if needed.
Notes
Serve over rice and garnish with extra pineapple and green onions.
Keyword chicken, pineapple, sweet and sour, tropical