Add marshmallows and butter into a microwavable bowl.
Melt in microwave on high for 1 1/2 to 2 minutes.
Mix marshmallows and butter until butter melts and mixture is smooth. (If the butter doesn't melt, microwave for an extra 15 seconds or so.)
Add cereal into marshmallow mixture.
What we're trying to avoid here is big gloppy amounts of white marshmallow
Once the marshmallow-butter mixture is evenly mixed in, pour into a greased 18 x 13" pan and allow to set
Cut in half.
Melt caramel bits and pour over half of the rice kris pies.
Cover caramel with other half of rice krispies.
Refrigerate to set up and then cut into pieces
Drizzle with melted chocolate.