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Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish.

Prepare the mashed potatoes: Place the quartered potatoes in a large pot and cover with cold water. Bring to a boil over high heat and cook for 15-20 minutes, or until fork-tender. Drain well.

Return the drained potatoes to the hot pot. Add the melted butter, warmed milk, sour cream, garlic powder, 1/2 teaspoon salt, and 1/4 teaspoon black pepper. Mash until smooth and creamy. Set aside.

Prepare the beef filling: In a large skillet, cook the ground beef and chopped yellow onion over medium-high heat, breaking up the meat with a spoon, until the beef is browned and the onion is softened, about 8-10 minutes. Drain off any excess fat.

Stir the ketchup, Dijon mustard, Worcestershire sauce, 1/2 teaspoon salt, and 1/4 teaspoon black pepper into the ground beef mixture. Cook for another 2 minutes, stirring constantly.

Assemble the casserole: Spread the beef filling evenly into the prepared 9x13 inch baking dish. Top with the mashed potatoes, spreading them to the edges of the dish. Sprinkle the shredded cheddar cheese evenly over the mashed potatoes.

Bake for 20-25 minutes, or until the cheese is melted and bubbly and the casserole is heated through. For a golden-brown top, you can broil for the last 1-2 minutes, watching carefully to prevent burning.

Remove from oven and let stand for 5 minutes before serving. Garnish with crumbled bacon and chopped green onions.


Preheat your oven to 375°F. Lightly grease a 9x13 inch baking dish.

Prepare the mashed potatoes: Place the quartered potatoes in a large pot and cover with cold water. Bring to a boil over high heat and cook for 15-20 minutes, or until fork-tender. Drain well.

Return the drained potatoes to the hot pot. Add the melted butter, warmed milk, sour cream, garlic powder, 1/2 teaspoon salt, and 1/4 teaspoon black pepper. Mash until smooth and creamy. Set aside.

Prepare the beef filling: In a large skillet, cook the ground beef and chopped yellow onion over medium-high heat, breaking up the meat with a spoon, until the beef is browned and the onion is softened, about 8-10 minutes. Drain off any excess fat.

Stir the ketchup, Dijon mustard, Worcestershire sauce, 1/2 teaspoon salt, and 1/4 teaspoon black pepper into the ground beef mixture. Cook for another 2 minutes, stirring constantly.

Assemble the casserole: Spread the beef filling evenly into the prepared 9x13 inch baking dish. Top with the mashed potatoes, spreading them to the edges of the dish. Sprinkle the shredded cheddar cheese evenly over the mashed potatoes.

Bake for 20-25 minutes, or until the cheese is melted and bubbly and the casserole is heated through. For a golden-brown top, you can broil for the last 1-2 minutes, watching carefully to prevent burning.

Remove from oven and let stand for 5 minutes before serving. Garnish with crumbled bacon and chopped green onions.
