In a bowl, combine all the meatloaf ingredients and mix until just combined.
Line a muffin tin with cupcake liners for easy cleanup.
Spoon the meatloaf mixture into the muffin liners, pressing down to form a dome shape.
Bake at 330°F for 25-30 minutes, or until fully cooked through.
In a saucepan, add potatoes, water, and salt. Bring to a boil, then reduce heat and simmer for 15-20 minutes, or until fork-tender.
Drain the potatoes and stir in butter and milk. Mash until smooth and creamy.
Transfer the mashed potatoes to a ziplock bag. Snip the corner and pipe them onto each meatloaf cupcake, resembling frosting.
Sprinkle with parsley for a fresh, colorful touch. Serve and enjoy your delicious meatloaf cupcakes with mashed potato "frosting"!