Preheat oven to 350 degrees. Line a 12-cup muffin pan with foil baking cups or spray it with nonstick spray. In a large bowl, combine all meatloaf ingredients. Thoroughly mix. Evenly distribute meatloaf mixture among the muffin cups and smooth out the tops with the back of a spoon. Bake until firm and cooked through with lightly browned edges, 20–25 minutes. Meanwhile, bring a medium pot of water to a boil. Add potatoes and once returned to a boil, reduce heat to medium. Cook until very tender, 15–20 minutes. Drain and transfer potatoes to a large bowl. Add remaining ingredients for mashies, except paprika. Thoroughly mash and mix. Evenly top mini meatloaves with mashies and sprinkle with paprika.