Add the chicken, then the pasta, then the remaining ingredients to a large stockpot or dutch oven, and cover. Bring to a boil. Stir and reduce to a simmer.
1 lb boneless, 1 lb spaghetti, 4 medium carrots, 1 medium red bell pepper, 1 bunch green onions, 4 tsp garlic, 1/4 cup soy sauce, 1/2 tsp garlic powder, 1/2 tsp onion powder, 1 tsp corn starch, 1 tbsp sugar, 1/2 tsp crushed red pepper flakes, 4 1/2 cups chicken broth, 2 tsp extra virgin olive oil