01 -
Combine sugar, butter and ice cream in heavy-bottomed pan. Bring to boil over medium heat.
02 -
Reduce heat slightly, cook 7-10 minutes while stirring constantly until digital thermometer reads 234°F.
03 -
Remove from heat, stir in both chocolates vigorously until melted and smooth.
04 -
Add marshmallow creme, blend well.
05 -
Pour into 8x8 pan, top with sprinkles if using.
06 -
Let cool to room temperature, then cut into pieces.