Brown the Beef:
In a skillet over medium heat, cook the ground beef until no longer pink. Drain any excess grease. Add chopped onion and sauté for 2–3 minutes until translucent. Season with garlic powder, paprika, salt, and pepper.
Mix the Sauce:
In a medium bowl, whisk together the cream of mushroom soup and milk until smooth. This creates the rich and creamy base for your casserole.
Layer in the Crockpot:
Grease your slow cooker with olive oil or butter.
Start with a layer of sliced potatoes on the bottom.
Add a portion of the cooked beef mixture.
Pour some of the soup mixture on top.
Repeat layers until all ingredients are used.
Top with Cheese:
Sprinkle shredded cheddar cheese on top of the final layer. If you love extra cheesiness, save a little to add during the last 30 minutes of cooking.
Cook:
Cover the crockpot and cook on Low for 6–7 hours or High for 3–4 hours, until the potatoes are tender and the casserole is bubbling.
Serve and Enjoy:
Serve hot, garnished with parsley or green onions. Pair with a green salad or steamed veggies for a balanced meal.