In a large skillet, brown the ground beef over medium heat. Add the diced onion and minced garlic and cook until the onion is translucent, about 3-4 minutes. Drain any excess fat.
In a large bowl, combine the cream of mushroom soup, milk, salt, black pepper, paprika, and oregano. Mix well until fully combined.
Layer half of the sliced potatoes at the bottom of the crockpot.
Add half of the cooked beef mixture on top of the potatoes. Pour half of the soup mixture over the beef.
Add a layer of 1 cup of shredded cheddar cheese.
Repeat the layers with the remaining potatoes, beef mixture, and soup mixture. Top with the remaining cheddar cheese.
Cover and cook on low for 6 hours, or until the potatoes are tender.
Once cooked, let it sit for a few minutes before serving.