Boil the diced potato in water with the lid off or slightly covered for so the water will not boil over (about 5 minutes), until you can stick a fork through the potato.

Remove from heat, drain the water and place in a large bowl.

Use a potato masher or fork to mash the potatoes.

Add salt, black pepper, plant-based butter (optional), and mix until smooth.

Add a little water if too dry.