01 -
Preheat oven to 375°F (190°C). Lightly grease a 9×9-inch baking dish or line with parchment paper for easy removal.
02 -
In a large bowl, combine ground beef, breadcrumbs, milk, egg, ketchup, garlic powder, onion powder, salt, and pepper. Mix gently until just combined, avoiding overworking the meat.
03 -
Press meat mixture evenly into prepared baking dish, creating a flat, compact layer. Bake uncovered for 20-25 minutes until partially cooked through.
04 -
While meatloaf bakes, combine mashed potatoes with sour cream and butter. Mix until smooth and creamy. Season with salt and pepper to taste.
05 -
Remove meatloaf from oven and carefully spread prepared mashed potatoes evenly over the surface, creating a smooth layer from edge to edge.
06 -
Sprinkle shredded cheddar cheese evenly over mashed potatoes. Return to oven and bake 10-15 minutes until cheese is melted, bubbly, and golden brown.
07 -
Allow casserole to rest for 5-10 minutes before slicing to help layers set. Garnish with fresh chopped parsley if desired and serve warm.