Add the cheese to the slow cooker and add the cornstarch. Toss the cornstarch with the cheese with clean, dry hands.
Add the softened cream cheese, garlic and milk, mix as well as you can. You can mix it more as it heats up.
Cook on low for 1 - 1.5 hours, stirring occasionally.
Serve with cubed bread and apples.
Notes
It's important to let leftover cheese fondue cool to room temperature before placing it in the fridge. Pour it into an airtight container and it should keep for up to 4 days. It can even be frozen for up to 2 months.
Other cheeses such as swiss, white cheddar or pepperjack can be used.
If you forget to soften the cream cheese, simply microwave for 30 seconds. That should do the trick!