Chicken, Potato and Chard Skillet Supper

Ingredients

• 12 ounces chard, (torn in 3-inch pieces and washed but not dried)
• 2 tablespoons olive oil (divided)
• 1 pound boneless, skinless chicken thighs
• 1/2 teaspoon salt
• 1/2 teaspoon dried marjoram
• 1/8 teaspoon ground black pepper
• 1 pound baby potatoes, (halved)
• 1/2 cup low sodium chicken broth
• 2 tablespoons balsamic vinegar