Bison Shepherd's Pie

Name: Bison Shepherd's Pie
Cuisine: European, British
Ingredients: 3 Russet or large yellow potatoes (about 5 cups chopped); 1 tbsp ghee (or butter); ½ cup milk (I use whole milk); 1 tbsp grated Parmesan cheese; ¼ tsp fresh chopped rosemary; ¼ tsp garlic powder; ¼ tsp salt; ¼ tsp black pepper; 1 lb ground bison/buffalo (sub. beef or turkey if preferred); 1 cup chopped yellow onion; 1 cu chopped carrots; 3 garlic cloves (1 tbsp minced); ½ cup frozen peas; ¼ cup red wine; 1 tsp Worcestershire sauce; ½ cup chicken broth; 1½ tsp fresh thyme leaves; 1½ tsp fresh sage leaves; 1 tbsp olive oil; fresh rosemary sprigs, for garnish