Preheat your oven to 375°F.

Clean the sweet potatoes thoroughly and pierce them several times with a fork.

Place the sweet potatoes directly on the middle rack of the oven.

Bake for 45 minutes to 1 hour, or until they are tender.

While the potatoes are baking, melt the butter in a small saucepan over medium heat.

Add the brown sugar, cinnamon, and pecans to the melted butter and stir until the mixture is smooth.

Once the potatoes are done, make a slit down the center of each one and gently squeeze to open.

Add the butter and brown sugar mixture into each potato.

Top each sweet potato with mini marshmallows.

Place them back in the oven for 2-4 minutes, until the marshmallows are golden and puffy.

For a crispier result, place them under the broiler for the last minute.