Preheat the oven to 375 degrees. In a large bowl, combine the ground beef, ground pork, minced chipotle peppers, egg, breadcrumbs, diced onion, minced garlic, salt, and black pepper. Mix until just combined, then shape into a loaf and place in a loaf pan.
Bake the meatloaf for 50 to 55 minutes until it reaches an internal temperature of 160 degrees. While the meatloaf bakes, place the sweet potato cubes in a pot of salted water. Bring to a boil and cook until tender, about 15 minutes. Drain the potatoes, then return them to the pot. Add the butter and milk, then mash until smooth.
In a separate bowl, stir together the black beans, corn, diced tomato, diced red onion, cilantro, and lime juice. Season with a pinch of salt if needed. Let the meatloaf rest for 5 minutes after baking, then slice and serve with the sweet potato mash and black bean salad on the side.