1. Preheat the Oven
Preheat your oven to 350°F (175°C). This ensures that the oven is ready to bake the casserole evenly.
2. Prepare the Baking Dish
Grease an 11×7-inch glass baking dish with cooking spray. This will prevent the casserole from sticking and make for easier cleanup.
3. Cook the Meat
Place a frying pan on the stove and turn the heat to medium.
Add the ground beef, chopped onions, and your choice of seasonings (garlic powder, paprika, or rosemary). Season with salt and pepper to taste.
Cook the mixture for a few minutes, stirring occasionally, until the meat is browned and crumbly and the onions are softened.
Discard any accumulated fat by draining the meat mixture in a colander or using a spoon to remove the fat from the pan.
4. Prepare the Soup Mixture
In a mixing bowl, combine the cream of mushroom soup, stock, and milk or cream. Stir until the mixture is well blended. This will be the creamy sauce that ties the casserole together.
5. Layer the Casserole
Arrange half of the thinly sliced potatoes in an even layer at the bottom of the prepared baking dish.
Pour about a quarter of the soup mixture over the potatoes, spreading it evenly.
Scatter half of the browned meat mixture over the soup and potatoes.
Sprinkle about half of the shredded cheese over the meat layer.
Repeat the layers: add another layer of potatoes, pour over more soup mixture, add the remaining meat, and top with the rest of the cheese.
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