Turkey Shepherds Pie w/ Sweet Potato

Name: Turkey Shepherds Pie w/Sweet Potato
Ingredients: 2 Sweet Potatoes (Large ); 1/8 Cup Brown Sugar; 2 Tbsp Butter; 1/4 Cup Parmigiano Reggiano Cheese; 1.5 Lbs Ground Turkey; 1 Cups Green Pepper; 1 Onions; 1 Cans French Style Green Beans; 3 Ounces Tomato Paste; 1 Tbsp Olive Oil; 1 Tsp Salt; 1 Tbsp Garlic; 1 Tsp Chipotle Powder; 1 Tsp Paprika; 1 Tsp Turmeric; 1 Tsp Cumin; 4 Ounces Water