In a large bowl cream butter until fluffy.
Add sugar and pumpkin puree, beat well.
Mix in egg and vanilla, scraping down sides to incorporate all ingredients.
In a medium bowl, whisk together flour, baking powder, salt, and ground cinnamon.
Beat flour mixture into liquid mix a little at a time until fully incorporated.
Cover dough with plastic wrap and chill for at least 1 hour.
Mix rolling sugar ingredients together in a small bowl.
When ready to bake, preheat oven to 350 degrees.
Line baking sheet with silpat.
Remove cookie dough from the fridge.
Use a medium scoop to scoop out dough and roll into balls.
Roll balls in cinnamon sugar mix, making sure they are coated well.
Place 2” apart onto prepared sheets.
Use a glass with a flat bottom to dip in sugar and flatten the balls.
Bake at 350 for 10-12 mins until they are slightly firm to the tough.
Let cool on baking sheets for 5 mins then transfer to wire rack to cool completely.