Prepare the slow cooker by coating with a light coating of cooking spray.
Add frozen hash browns, chopped onion, and minced garlic to the slow cooker.
Pour in chicken broth and stir in the condensed cream of chicken soup.
Sprinkle in salt, pepper, and Italian seasoning, then stir everything to combine.
Cover and cook on Low for 6–7 hours or on High for 3–4 hours, until potatoes are tender.
About 30 minutes before serving, add cubed cream cheese to the soup and stir well.
Cover and let cook for 20 minutes, then whisk until the cream cheese is fully incorporated and smooth.
Stir in shredded cheddar cheese until melted and creamy.
Taste and adjust seasoning as needed, then serve warm with your favorite toppings.