Preheat the oven to 180°C (356°F).
In a bowl, mix rice flour, peanut butter, erythritol, and baking powder until well combined.
Shape the dough into bite-sized balls.
Place the dough balls on a baking tray lined with parchment paper.
Bake in the preheated oven at 180°C for 12-15 minutes.
Remove from the oven and let the cookies cool completely on a cooling rack.