1Peel the sweet potatoes and carrots, then cut them into evenly sized chunks.
Place the sweet potatoes and carrots in a large pot and cover with water.
Bring the water to a boil over medium-high heat, then reduce the heat to medium and simmer until the vegetables are tender, about 15-20 minutes.
Drain the vegetables and return them to the pot.
Add the butter to the pot and mash the vegetables using a potato masher or fork until smooth.
Season with salt and pepper to taste, and mix well.
Serve warm as a side dish.