01 -
In a wide, sturdy pan, mix together butter, ice cream, and sugar over medium heat until it starts boiling.
02 -
Turn the heat down slightly and keep stirring for 7-10 minutes. Stop when a candy thermometer hits 234°F.
03 -
Take it off the heat, toss in both chips, and stir until smooth and fully melted.
04 -
Blend in the marshmallow creme thoroughly until the mixture is consistent.
05 -
Transfer it to an 8x8 pan, throw on some sprinkles (if you want), and let it cool completely.
06 -
Pop it out of the pan, then cut it up into about 24 squares.