Preheat the oven to 170°C (338°F).
In a bowl, mix the whole wheat flour and baking powder together.
In another bowl, combine erythritol, egg, and unsalted butter and mix well.
Add the wet ingredients to the dry ingredients and fold together with a spatula.
Shape the dough into bite-sized pieces and place them on a baking sheet.
Bake in the oven at 170°C (338°F) for 15 minutes.