01 -
Preheat oven to 375°F (190°C). Grease a 9×9-inch baking dish or line it with parchment paper.
02 -
In a large bowl, combine the ground beef, breadcrumbs, milk, egg, ketchup, garlic powder, onion powder, salt, and pepper. Mix gently until just combined.
03 -
Spread the meat mixture evenly in the bottom of the prepared baking dish. Bake uncovered for 20–25 minutes.
04 -
Warm the mashed potatoes and stir in sour cream and butter. Season with salt and pepper.
05 -
Carefully spread the mashed potatoes over the baked meatloaf layer.
06 -
Sprinkle shredded cheddar evenly over the top. Bake an additional 10–15 minutes until the cheese is melted and bubbly.
07 -
Let cool for 5–10 minutes. Garnish with chopped parsley if desired. Slice and enjoy.