My mother every Thanksgiving made her sweet potatoes this way from Libby's canned sweet potatoes and or yams. I'm pretty sure she got the recipe from the can. I don't know for sure but we loved them this way as kids and my children love them this way also. So easy to make and so good! I am asked every year if I'm going to make them and every year its always, yes. ( Jodi especially loves these ) See Jodi, I did add it to my recipies!
Place sweet potatoes with juice in a medium baking dish. Distribute butter pieces evenly over the sweet potatoes. Sprinkle with brown sugar. Layer with miniature marshmallows.
2Cover and bake in the preheated oven 25 minutes, or until sweet potatoes are tender and marshmallows have melted. Then turn broiler on and put back in to brown the top. Watch carefully as it browns fast. I have burned mine many a time.
3*** Most times I added 2 cans of sweet potaoes and drained one.
*** We like to mash them down on our plates and add butter. Mmmmm!