Instant Pot Instructions:

1. Pour 1 ½ cups of water into bottom of Instant Pot. Add potatoes into a steamer basket and drop the basket into the Instant Pot. Cover Instant Pot and secure the lid. Make sure valve is set to sealing. Set manual/pressure cook button to 8 minutes. When time is up move valve to venting and remove the lid.
2. Remove steamer basket and discard water. Then pour the potatoes into the empty pot. Mash the potatoes. 
3. Stir in the butter, cream cheese, sour cream, milk, salt and pepper until creamy and smooth.
4. Taste test and add more salt and pepper if needed. 

Slow Cooker Instructions:

1. Add potatoes into slow cooker and add water until potatoes are covered. 
2. Cover and cook on high for 2-3 hours, or until potatoes are tender. Drain off water.
3. Mash the potatoes. 
4. Stir in the butter, cream cheese, sour cream, milk, salt and pepper until creamy and smooth.
5. Taste test and add more salt and pepper if needed.