Preheat oven to 400°F. Line a baking sheet with parchment paper and lightly brush the surface with olive oil.
In a large bowl, combine mashed sweet potatoes, egg, almond flour, arrowroot starch, baking powder, garlic powder, salt, and pepper. Stir until a thick, scoopable batter forms.
Fold in Parmesan and chives if using.
Scoop heaping tablespoon portions onto the prepared sheet (or pipe with a large star tip for ridges). Brush the tops lightly with the remaining olive oil.
Bake for 20 to 25 minutes, until puffed, set in the center, and golden at the edges.
Cool on the pan for 5 minutes, then serve warm. Great with yogurt dip or sour cream.
Notes
Make it dairy-free by skipping Parmesan. For extra crisp edges, use convection if available. Leftovers reheat well in a 375°F oven or air fryer for 4 to 6 minutes. Freeze baked puffs on a sheet, then store in a bag up to 2 months; reheat from frozen.