Skillet Roasted Chicken with Rosti Potatoes and Steamed Veggies

Name: Skillet-Roasted Chicken with Rosti Potatoes and Steamed Veggies
Ingredients: 2-2 1/2 pounds baby Yukon Gold potatoes, peeled only around the middle; 4 tablespoons butter, divided; 2 tablespoons extra virgin olive oil (EVOO); 4 boneless, skinless chicken breasts; Salt and ground black pepper; 2 tablespoons flour; 2 cups chicken stock; 2-3 tablespoons heavy cream; 2 tablespoons grainy mustard; 1 pound baby carrots; 1 pound baby zucchini; 1 tablespoon chopped chives