Step 1: Preheated OvenPreheat the oven to 350°F (175°C). Now, get prepared to chop the ingredients and put them together. Lightly grease with some cooking spray or a pat of butter a 9x13-inch baking dish.
Step 2: Cook the Ground BeefBrown the ground beef in a large skillet over medium heat, breaking it up into little crumbles as it cooks. Add salt, pepper, and any desired seasonings, such as garlic powder or Italian herbs. Remove excess fat and set aside once finished browning.
Step 3: prepare Potato and Onion As the ground beef browns, peel and wash some potatoes and thinly slice them so they layer 1/8 inches so that they oven cook evenly. Chop fine the onion so it will be evenly spread throughout in the casserole.
Step 4: Add the Layers to the CasseroleNow for the good part-assembling the ingredients. In your prepared baking dish, put in half the sliced potatoes, placed equally on the bottom. Add half the ground beef cooked, sprinkle on half of the chopped onions. Repeat all this with the remaining potatoes, beef, and onions.
Step 5: Prepare Cream Sauce In a medium bowl, combine cream of mushroom soup and milk. Stir until smooth, with no lumps forming. Spread over casserole for an even layer. This soup mixture will cook down to be a creamy sauce, which holds everything together.
Step 6: Add CheeseOn top of the casserole, spread shredded cheddar cheese. This will create a scrumptiously gooey layer, richening up the flavor.
Step 7: Bake the CasseroleLine a baking dish with aluminum foil to cover, then bake in the preheated oven for 1 hour. Then remove it, and bake uncovered for an extra 20-30 minutes, or until the potatoes are tender and the cheese is golden and bubbling.
Step 8. Let it Rest and ServeOnce the casserole is fully cooked, allow it to rest for about 10 minutes before serving. This helps the flavors meld and makes it easier to cut into neat servings. Garnish with fresh parsley, if desired, and enjoy your comforting potato hamburger casserole.