Preheat your oven to 375°F and lightly grease a standard muffin tin with a touch of olive oil.
In a large mixing bowl, combine the ground beef, egg, finely diced onion, grated carrot, tomato paste, sea salt, and black pepper.
Mix the ingredients gently by hand until just incorporated, taking care not to overwork the meat to keep the texture light.
Divide the meat mixture evenly among the muffin cups, pressing down slightly to ensure they hold their shape.
Bake for 20 to 25 minutes or until the internal temperature of the meat reaches 160°F.
Remove the tin from the oven and carefully pipe or spoon the warm mashed potatoes onto the top of each meatloaf cupcake.
Place the tin back in the oven under the broiler for 2 to 3 minutes until the potato peaks are lightly golden.
Let the meatloaves rest for 5 minutes before removing them from the tin and garnishing with fresh parsley.