Peel and cube the sweet potatoes into uniform sizes.

Place the cubed sweet potatoes in a large pot and cover them with water.

Bring to a boil over medium-high heat and then reduce to a simmer.

Cook for about 15-20 minutes until fork-tender.

Drain the sweet potatoes in a colander.

Return the drained sweet potatoes to the pot or a mixing bowl and mash until smooth.

Add the softened butter and milk to the mashed sweet potatoes.

Stir in the brown sugar, cinnamon, salt, and pepper to taste.

Transfer to a serving dish and serve warm.