Step 1 of 11
Cheeseburger and Potato Casserole
Preheat the oven to 400°F.
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Step 2 of 11
Cheeseburger and Potato Casserole
Spray a 9x13-inch baking dish with nonstick cooking spray.
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Step 3 of 11
Cheeseburger and Potato Casserole
Dice the potatoes into 3/4-inch pieces and place in the baking dish. Finely chop the onion and set aside.
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Step 4 of 11
Cheeseburger and Potato Casserole
Drizzle the olive oil over the potatoes and season with the garlic powder, salt, and black pepper. Stir with a rubber spatula to coat the potatoes in oil.
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Step 5 of 11
Cheeseburger and Potato Casserole
Roast the potatoes on middle rack of oven until they are tender but slightly underdone and just starting to brown, about 15 minutes.
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Step 6 of 11
Cheeseburger and Potato Casserole
Spray an extra-large skillet with nonstick cooking spray and set over medium-high heat. Add the ground beef and onion. Cook the beef, breaking it up with a wooden spoon as it cooks, until browned, 7-8 minutes. Add the ketchup, mustard, Worcestershire, paprika, garlic powder, salt, and black pepper. Stir to combine and cook for 1-2 minutes longer.
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Step 7 of 11
Cheeseburger and Potato Casserole
Remove the potatoes from the oven and transfer to a large mixing bowl. Add the beef mixture, along with the shredded cheese. Fold to mix the beef and potatoes together and melt the cheese.
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Step 8 of 11
Cheeseburger and Potato Casserole
Transfer the beef and potato mixture to the baking dish and smooth into an even layer. Sprinkle the shredded cheddar cheese over the top.
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Step 9 of 11
Cheeseburger and Potato Casserole
Bake the casserole for on middle rack of oven until the cheese is melted and lightly golden brown, 12-15 minutes.
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Step 10 of 11
Cheeseburger and Potato Casserole
Check to see that casserole is done. Remove from oven or add time as needed.
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Step 11 of 11
Cheeseburger and Potato Casserole
Allow casserole to cool for 5 minutes. Sprinkle with minced green onion. Plate and serve immediately with additional ketchup, if desired.