Preheat the oven to 180°C (356°F).
In a bowl, mix almond flour, protein powder, baking powder, and salt.
In another bowl, combine Greek yogurt, erythritol, and vanilla extract.
Combine both mixtures to form the dough.
Add chopped pistachios to the dough and mix well.
Flatten the dough into a round shape and cut into 6 triangle pieces.
Place the pieces on a baking sheet lined with parchment paper, and top with pistachios.
Bake in the oven at 180°C for 15-20 minutes.