Break chocolate into pieces and place in a pyrex or other microwaveable bowl.
If opting to add the peanut butter, add the peanut butter to the bowl also.
Melt chocolate (and peanut butter) using 20 second bursts in the microwave and stirring between each burst. When most but not all of the chocolate pieces have melted, allow the remaining pieces to melt by continuing to stir and allowing the heat of the melted chocolate to melt these remaining pieces.
Add noodles and melted chocolate to a mixing bowl and stir to combine.
Using a dessertspoon, spoon mixture onto the trays in clusters. Add sprinkles, candy eyes or other decorations if desired.