Garlic Pepper Chicken with Green Beans Stir Fry | Sauteed Pepper Chicken

2 lb. Chicken thighs, boneless, skinless with excess fat trimmed off, cut bite size 1.5 Tbs Corn starch or more as needed to coat 1 Tbs Soy sauce 1 Tsp Rice wine vinegar or lemon juice 1/2 Tsp Freshly ground black pepper 1 Tsp Garlic, finely chopped 1 Tsp Ginger, minced 2 cups canola oil, for frying 1 Shallot, peeled , chopped 1Tbs Garlic, chopped 1 Tsp Ginger, minced 2 cups green beans, picked cut about 2 inches long 2cups bell peppers red/yellow/orange, cut bite size 1 Lemon, juiced or about 2 tbs or vinegar 1 Tsp Corn starch + about 4 Tbs water 1/2 Tsp Freshly ground black pepper 1 Tbs Butter ( used salted ) or more! 2 Scallions, chopped for finishing and garnish 2 Tbs Parsley, chopped for finishing and garnish Salt to taste or as needed