Preheat your oven to 180°C/350°F. Add your softened butter, sugar, and egg to the blender. Close the lid and blend for 1 minute.
Next, add the remaining ingredients into the blender. Close the lid and blend for another minute. Your dough will be pretty loose, let the dough sit for 5-10 minutes so that the coconut flour can absorb the liquid and thicken a bit.
Form 12 cookies with a scooper or two spoons. Each cookie should be about the size of a tablespoon. Mix the cinnamon and sweetener together in a small bowl. Dip each cookie in the cinnamon/sweetener mix and place it on a lined baking pan. If you would like gently press the top of each cookie with your fingers to flatten the top.
Place your cookies in the oven on the top rack. Bake for 10-12 minutes or until the edges start to turn golden brown. Let your snickerdoodles cool and enjoy!
If you want to dip your cookies in the cinnamon/sweetener mix a second time it is best to do that while the cookies are still warm. This will help the mixture stick to the cookies.