Defrost your phyllo shells and lay them out on a platter.
Add your marshmallow fluff to a bowl and microwave for about 30 seconds.
Remove and add stir in 15-17 drops of food coloring. (Until you achieve the color you like.)
Add dyed fluff into a plastic bag or piping bag. This is optional but it strongly encouraged since it allows you to neatly squeeze the filling into each shell.
Add 1-2 more drops of green food coloring into each shell and use a toothpick to make a swirl. (This is purely for aesthetics.)
Stick in a pretzel stick on an angle into each cauldron. (You may need to trim the pretzel.)
Finally, "spookify" your cauldrons by adding your spider rings and your Halloween sprinkles!
Serve within a few hours.
Yield* 15 cauldronsThese cauldrons should stay crispy at room temperature for a few hours.To make them in advance, place the green marshmallow fluff in a sealed plastic bag. Then when you're ready to assemble your cauldrons, snip off the corner of the bag and squeeze away.