Apple Cider Chicken

Bahan-bahan (4 porsi)

• 4 teaspoons extra-virgin olive oil (divided)
• 1 1/2 pounds boneless skinless chicken thighs ((about 8, depending on size))
• 1 teaspoon kosher salt (divided)
• 1/2 teaspoon freshly ground black pepper (divided)
• 1/2 cup fresh apple cider
• 2 teaspoons Dijon mustard
• 3 medium firm (sweet apples, cored and cut into 1/2-inch slices (I used Gala))
• 2 teaspoons chopped fresh rosemary (plus additional for serving)