In the crockpot, add the potatoes, garlic, dried herbs, and chicken broth.
Put the lid on the crockpot and slow cook on high for 4 hours.
Once the potatoes are cooked, pour the entire contents of the crockpot into a blender and blend until smooth (at least 30 seconds).
Pour the mashed potatoes back into the crockpot and stir in the heavy cream and parmesan cheese.
Once the parmesan cheese has melted, add salt to taste.
Serve warm with melted butter on top. You can leave them in the pot on the "keep warm" setting until the rest of the dinner is ready.