Put the sweet potatoes, white potatoes and carrots in a pot and cover with water.
Boil on medium / high heat. Once boiling, turn down to medium-low and keep boiling for another 15-20 minutes until the vegetables feel soft with a fork.
Take the pot off the heat and simmer.
Transfer the vegetables to a mid sized bowl. Add the almond milk, rosemary, chives, salt and pepper. Mash with a potato masher or mix with a mixer.