Sprinkle chicken with Seasoning. Melt butter in large skillet on medium heat. Add chicken; cook 6 to 7 minutes per side or until cooked through. Remove from skillet; keep warm.
Stir green onions into skillet. Cook and stir 2 minutes. Mix broth and flour in small bowl with wire whisk until well blended. Add to skillet. Bring to boil. Reduce heat to low; simmer 2 minutes, stirring occasionally. Stir in sour cream; simmer 2 minutes. Spoon sauce over chicken to serve.