Add potatoes, cauliflower, and broth to the Instant Pot. Seal lid and cook on Manual setting for 5 minutes.
Quick release pressure when cycle is complete. Remove potatoes and cauliflower from the liquid and place in the bowl of a mixer. Add ghee or butter and salt. Whip until smooth and creamy.
Alternatively, use a potato masher to mash the potatoes and cauliflower until desired consistency.
