Good-Cooking - Chicken Stroganoff

Ingredients

• 1 tablespoon plus 1 teaspoon vegetable oil, divided
• 10 ounce boneless, skinless chicken breast, cut into 1/2-inch strips
• 2 cups sliced mushrooms
• 1 cup sliced onions
• 1 cup low sodium chicken broth
• 2 teaspoons all-purpose flour
• 3 tablespoons fat-free sour cream
• 1 teaspoon red wine vinegar
• 1 teaspoon Dijon-style mustard
• 1/4 teaspoon pepper