In a medium mixing bowl, whisk all sweet and sour sauce ingredients. Set your sauce aside until ready to use.
Place the chicken pieces into a large bowl. Sprinkle with flour, sea salt and pepper, then toss well to evenly coat the chicken.
Heat the oil in a large skillet, or cast iron over medium-high heat.
Add in your coated chicken and cook for about 6 minutes while gently turning and stirring, until nicely browned.
Drizzle your sweet and sour sauce over the top of your chicken, then bring to a simmer.
Once simmering, reduce heat to a LOW simmer and stir in the onion and peppers.
Continue to simmer on LOW heat for about 10 minutes, or until chicken is cooked through and veggies are tender. Be sure to stir frequently, so the sauce doesn't stick to the bottom of the pan as it thickens.
Once your sweet and sour chicken is ready, sprinkle with green onions and enjoy!