Clump O'Marshmallows

I had 2 left over sweet potatoes (or are they yams?) sitting on the counter and no one was eating them. I baked them and still no takers. Then I remembered the clump of marshmallows in the pantry. When marshmallows are stuck together in a ball it's hard to measure the right amount.

Candied Sweet Potatoes 
From allrecipes.com

4 pounds sweet potatoes, quarters
1 1/4 c. butter
1 1/4 c. brown sugar
3 c. miniature marshmallows, divided
1 t. ground cinnamon
1/4 t. ground nutmeg

Preheat oven to 400 degrees F. Grease a 9x13 inch baking dish.
 
Bring a large pot of water to a boil. Add potatoes and boil until slightly underdone, about 15 minutes. Drain, cool and peel.
 
In a large saucepan over medium heat, combine butter, brown sugar, 2 cups marshmallows, cinnamon and nutmeg. Cook, stirring occasionally, until marshmallows are melted.
Stir potatoes into marshmallow sauce. While stirring mash about half of the potatoes, and break the others into bite-sized chunks. Transfer to prepared dish.
 
Bake in preheated oven for 15 minutes. Remove from oven and cover top evenly with remaining marshmallows. Top with more if desired. Return to oven and bake until marshmallows are golden brown.