Cook and puree sweet potatoes.
Heat oil in large pot over medium heat. Add onion and bell pepper and cook until onion is translucent. Add garlic, jalapeƱo, and meat and cook 5 minutes.
Add tomato paste, spices, and tomatoes until liquid reduces (about 15 minutes). Add corn and black beans and 4 tbsps of cilantro and spread in a 9X13 Pyrex.
Mix 1/2 cup of milk and 2 tbsps of butter with pureed sweet potatoes and spread over meat mixture.
Bake on 400F for 20-30 minutes until brown. Garnish with remaining cilantro.