Preheat the Oven:

Preheat your oven to 375°F (190°C). Grease a muffin tin.

Prepare the Dough:

On a lightly floured surface, roll out the puff pastry sheet to smooth any creases.

Brush the entire surface of the puff pastry with melted butter.

Roll and Cut the Dough:

Starting from one end, tightly roll up the puff pastry to form a log.

Cut the log into 1-inch slices.

Shape the Cruffins:

Take each slice and gently twist it to form a spiral.

Place each twisted slice into a greased muffin tin cavity, with the cut side facing up.

Bake the Cruffins:

Bake in the preheated oven for 20-25 minutes, or until golden brown and puffed.

Coat the Cruffins:

While the cruffins are baking, mix together the granulated sugar and ground cinnamon in a shallow bowl.

Once the cruffins are done baking, remove them from the oven and let them cool for a few minutes.

Brush each cruffin with melted butter, then roll in the cinnamon-sugar mixture until well coated.

Fill the Cruffins (Optional):

If desired, fill a piping bag with dulce de leche or chocolate spread.

Insert the tip into the center of each cruffin and squeeze gently to fill.