PREHEAT oven to 350°.
DRAIN syrup from can; RESERVE; PLACE yams in a shallow baking dish.
In a saucepan over medium heat, COMBINE sugar and butter with reserved syrup; bring to a BOIL, STIRRING until thickened.
POUR sauce evenly over yams; TOP with layer of miniature marshmallows.
BAKE until marshmallows have melted, about 20 to 30 minutes.
Use canned Bruce's yams; drain syrup from the can, reserving syrup for use in recipe.
Per Serving (excluding unknown items): 542 Calories; 16g Fat (25.5% calories from fat); 3g Protein; 99g Carbohydrate; 9g Dietary Fiber; 41mg Cholesterol; 192mg Sodium. Exchanges: 4 Grain(Starch); 3 Fat; 2 1/2 Other Carbohydrates.