1. In a bowl place the melted butter, egg and erythritol.
2. Mix well.
3. Add the ground almonds and oat flour.
4. Mix well.
5. Add the white chocolate in small pieces.
6. Integrate well into a dough.
7. On a baking sheet, place parchment paper.
8. Form the biscuits.
9. Bake for 12 minutes or until crispy.