01 -
Preheat the oven to 375°F. Butter a 9x13-inch baking dish.
02 -
Cook the ground beef and onion in a large skillet over medium-high heat for 7-9 minutes, breaking up the meat, until browned and no longer pink. Drain excess grease.
03 -
Stir in the garlic, salt, pepper, smoked paprika, and thyme. Cook for 30-60 seconds, just until the garlic smells fragrant.
04 -
In a bowl, whisk together the cream of mushroom soup, milk, and sour cream until smooth.
05 -
Spread half the sliced potatoes in the baking dish. Add half the beef, half the sauce, and 3/4 cup cheddar. Repeat with the remaining potatoes, beef, sauce, and another 3/4 cup cheddar.
06 -
Cover tightly with foil and bake for 55-65 minutes, until the potatoes in the center are nearly tender when pierced with a knife.
07 -
Remove the foil, sprinkle with the remaining 1/2 cup cheddar, and bake uncovered for 12-15 minutes until bubbling and golden. Rest 10 minutes, then top with parsley and serve.