Shaena's Shepherd's Pie

Name: Shaena's Shepherd's Pie
Prep time: 25 min
Cook time: 42 min
Total time: 1 h 7 min
Cuisine: European, British
Ingredients: 6 butter potatoes, peeled and cut into 2 inch pieces; 1/4 cup sour cream; 1 tbsp butter; 1/8 tsp salt; 2 tsp olive oil; 1 cup onion, chopped; 2 medium carrots, diced; 2 medium stalks celery, diced; 1 lb ground turkey; 3 tbsp all-purpose flour; 1 tbsp rosemary, finely chopped (or 1 tsp dried); 1 tsp dried thyme; 1/2 tsp salt; 1/4 tsp ground black pepper; 2 cups chicken broth