Southwestern Shepherds Pie

Name: Southwestern Shepherd's Pie
Ingredients: 2 tablespoons olive oil; 1 medium onion, diced; 1 small green bell pepper, diced; 1 tablespoon minced garlic; 1 tablespoon chopped green jalapeño; 1 pound ground beef; 1 tablespoon tomato paste; 1 tablespoon chili powder; 1 teaspoon ground cumin; 1/2 teaspoon ground cinnamon; Salt and pepper, to taste; 2 cups tomatoes, chopped; 1/2 cup cooked corn; 1/2 cup black beans, rinsed; 1/4 cup chopped cilantro; 1 1/2 pounds sweet potatoes, peeled and cut in chunks; 2 tablespoons butter; 1/2 cup milk