In a stand mixer with a paddle attachment, or using electric beaters, cream together the avocado oil, maple syrup, vanilla extract, and coconut sugar on medium speed for about 5 minutes, until smooth and slightly caramel-like in texture.
Add the egg and mix until fully incorporated.
In a separate bowl, whisk together the almond flour, arrowroot starch, baking powder, and sea salt. Add to the wet ingredients and mix until a thick dough forms.
Cover the dough and refrigerate for at least 2 hours.
Preheat the oven to 350°F and line two baking sheets with parchment paper (see note).
Using a cookie scoop or spoon, scoop balls of dough onto the prepared baking sheets. The dough will be sticky. Space cookies about 2 inches apart.
Spread the sprinkles onto a plate or piece of parchment paper. Roll each dough ball gently between your hands, then roll in the sprinkles to fully coat. Place back onto the baking sheet.
Bake for 11–14 minutes, until the edges are just starting to turn light golden and the centers look set.
Let cookies cool on the baking sheet for 10–15 minutes before transferring to a wire rack to cool completely.