Sautéed Chicken and Apples with Rosemary

Name: Sautéed Chicken and Apples with Rosemary
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: American
Ingredients: 1/2 tablespoon unsalted butter; 1/2 tablespoon extra-virgin olive oil; 1 small sweet onion, thinly sliced (about 1 cup); 2 small red apples, sliced; 1 1/2 pounds boneless, skinless chicken breasts, cut into 1-inch strips; 1 heaping tablespoon fresh rosemary, finely chopped, divided; 1/2 teaspoon salt; 1/4 teaspoon black pepper; 2 tablespoons apple cider vinegar