1. Preheat your oven to 350°F (175°C).
2. In a large bowl, cream together the softened butter and sugar until light and fluffy.
3. Add the egg and vanilla extract, mixing until well combined.
4. In another bowl, whisk together the gluten-free flour, baking powder, cinnamon, and salt.
5. Gradually add the dry ingredients to the wet ingredients, mixing until a dough forms.
6. Roll the dough into balls and place them on a baking sheet lined with parchment paper.
7. Flatten each ball slightly and sprinkle with additional cinnamon and sugar if desired.
8. Bake for 10-12 minutes or until the edges are lightly golden.
9. Allow to cool on the baking sheet for a few minutes before transferring to a wire rack to cool completely.

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