Wash the yams thoroughly, pat dry, and pierce 5-6 times with a fork. Place the yams on a microwave-safe plate and microwave for 10 minutes, turning halfway through.
Preheat the oven to 400° Fahrenheit.
Use a sharp knife to peel the skin off the yams. Be careful because they will be hot from the microwave.
Slice the yams into 1½ inch pieces and place them in a casserole dish. Slice the butter into pieces and arrange it on top of the yams.
Mix the salt and brown sugar together in a bowl and sprinkle it over the top of the yams.
Place it in the oven, uncovered, for 40 minutes. Take it out every 10 minutes to stir.
After 40 minutes, add the mini marshmallows on top. Place the oven rack about 6 inches under the heating element and broil for about 30 seconds to toast the top of the marshmallows. Watch it VERY closely!
The sauce will thicken a little as it cools.
Video
Notes
Tips:
Do not cover the sweet potatoes with aluminum foil. You want some of the liquid to evaporate and the brown sugar will begin to caramelize.
Storage:
Storage: Store in a shallow, airtight container for up to 5 days.
Reheating: Reheat in the microwave for 2-3 minutes.
Freezing: Store in an air-tight container or freezer bag for 2-3 months.