Microwave two sticks of unsalted butter in the fridge for only 30 seconds.
Add the butter to the bowl of a stand mixer, or a bowl.
Add sugars, and cream the mixture together.
Add the egg and vanilla extract and mix.
Add flour, baking powder, cinnamon, and salt. Mix until dough comes together and is well combined.
Preheat the oven to 350°F.
In a small bowl, add white sugar and cinnamon for the topping and mix.
Shape the snickerdoodle dough into 1 inch balls.
Roll each dough ball in the cinnamon-sugar mixture until coated.
Place the coated dough balls onto a baking sheet lined with parchment paper, spacing them around 2 inches apart.
Gently press down on each dough ball with the bottom of a glass to slightly flatten.
Bake for 8 to 10 minutes, or until the edges are lightly golden.
Remove from the oven and let the cookies cool on the baking sheet for a few minutes before transferring them to a wire rack to cool completely.
Notes
I love making a big batch of these cookies and freezing them in Souper Cube Cookie Cubes, so I can pop one or two out and bake in our toaster oven whenever we want a sweet treat.