In a bowl, mix ketchup, chili sauce, oyster sauce, and sugar together.
Clean and cut chives into 1 inch pieces and bell peppers into bite size cubes.
Clean and cut chicken into half inch bite size pieces.
In a bowl, mix chicken with salt, white pepper, and cornstarch. Make sure all the pieces are equally coated. Set aside.
In a large frying pan, heat up 1 cup of vegetable or canola oil using high heat. When oil is hot and bubbling, turn down the heat to medium and add in chicken. Don't overcrowd the pan and fry chicken in batches. Fry chicken 3 minutes per side or until golden brown and 165ºF. Once cooked, take chicken out of the pan and cool on paper towels or a cooling rack.
In a clean large pan, heat up in 1 tablespoon of oil and add in bell peppers. Stir fry for ~2 minutes. Add chicken and chives to the pan.
Mix in prepared sauce and stir everything together. Simmer for another 30 seconds to 1 minute. Immediately serve over a hot bowl of white rice or noodles!