1. Preheat Oven:
   • Preheat your oven to 350°F (175°C).
2. Cook the Ground Beef:
   • In a large skillet over medium-high heat, cook the ground beef until browned and crumbly, about 5-7 minutes. Drain excess grease and set aside.
3. Make the Sauce:
   • In a medium bowl, combine condensed cream of mushroom soup, milk, chopped onion, salt, and pepper. Mix until smooth.
4. Layer the Casserole:
   • In a 2-quart baking dish, layer the ingredients in the following order:
     • Thinly sliced potatoes
     • A portion of the soup mixture
     • Browned ground beef
   • Repeat the layers until all ingredients are used, ending with the soup mixture on top.
5. Bake:
   • Cover the dish with aluminum foil and bake in the preheated oven for 1 to 1 ½ hours, or until the potatoes are tender.
6. Add Cheese:
   • Remove the foil and sprinkle the shredded cheddar cheese over the top. Return the dish to the oven and bake for another 5-10 minutes, or until the cheese is melted and bubbly.
7. Serve:
   • Let the casserole cool for 5 minutes before serving. Enjoy warm!

Notes

• For added flavor, sauté the onions with the ground beef before layering.
• Substitute cream of mushroom soup with cream of chicken or celery for a different twist.
• Add extra veggies like peas, carrots, or bell peppers to make it heartier.