If using a store-bought, prepared pie crust, allow to thaw to room temperature so it's pliable and easy to work with.
On a lightly floured surface, roll pie crust from 9 inches to about 12 inches.
Brush crust with melted butter. A tablespoon doesn't seem like a lot of butter, but it goes a long way!
In a small bowl, combine granulated sugar and cinnamon.
Sprinkle cinnamon-sugar mixture evenly over pie crust. Press lightly to help adhere.
Roll the pie crust into a log, coiling it tightly. Seal the edges.
Carefully wrap the pie crust log with plastic wrap, and chill for at least an hour, up to 24 hours.
Line baking sheets with parchment paper or silicone baking mats -- this step is a must!
Slice into roughly 1/4-inch coins.
Arrange coins on baking sheets two inches apart.
Bake at 350 degrees for 10-12 minutes, or until edges are lightly browned.
Remove from heat, cool on baking sheets for 2 minutes (not much longer or they'll stick), then carefully flip cookies over, and allow to cool completely.