Spread the cinnamon powder and sugar on the puff pastry. (Optional step)
Roll it up like a swiss roll.
Divide the rolled up puff pastry into 6 equal portions width-wise.
With the cut edge facing up, use the palm to press each piece down, then roll the pastry into a circle.
Line the egg tart tins (or muffin cups) with the pastry, ensuring it is slightly higher than the pastry tin.
Using a fork, poke a few holes on the pastry lining and leave it in the freezer for 30 minutes or overnight.