Peel and cut potatoes into chunks. Add to slow cooker and sprinkle with Italian seasoning.
Add garlic and broth. Cover and cook for 6-8 hours on low OR 3-4 hours on high. Check potatoes at the 3 hour mark (on high) or 6 hour mark (on low). If you can easily insert a fork into the potatoes, they are ready for the next step.
Add butter to crock pot, adding only ½ of the portion at first. Mash the butter into the potatoes.
Add the remaining half of the butter, salt and pepper to taste, and continue to mash until they are smooth as possible. You can also use an immersion blender for this step.
Serve finished potatoes with a dollop of butter and a sprinkle of parsley if desired.
Video
Notes
Once your potatoes are smooth, with no large chunks, you can stop mashing. If you mash them too much they may end up gummy.Nutrition values are an estimate. Your actual counts may vary based on the exact amounts of ingredients used.