Bake Puff Pastry Cups according to box directions.
Prepare pudding (or use store bought prepared pudding).
When the Puff Pastry Cups are baked and cooled, spray the cups with black spray food coloring (take the cups outside to spray). Allow to dry (15 minutes or so). Note, if you do not want to color the pastry, feel free to skip this step, and continue below.
Fill the prepared (black) cups with chocolate pudding. This may be easiest if you fill a small ziplock type bag with pudding, then snip off one corner and squeeze the pudding into the little cups. Fill to just below the edge of the pastry cup.
Add a pretzel stick (I broke the sticks and used about 2/3 of a stick), then top the pudding with mini marshmallows. I found it best to tear each mini marshmallow in half, and press them together in a little heap, over the pudding.
Place the cauldrons on a baking sheet and broil in the oven for 30 seconds to 1 minute, or until the marshmallows are puffy and golden brown. The marshmallows will shrink down a bit as they cool.