Preheat the oven to 180°C.
In a bowl, mix protein powder, almond flour, baking powder, salt, and matcha powder.
In a separate bowl, whisk together the egg, milk, erythritol, and melted coconut oil.
Combine the dry ingredients with the wet ingredients and knead into a dough.
Roll out the dough to 2cm thickness and cut into triangles.
Place the dough pieces on a baking tray lined with parchment paper.
Bake in a 180°C oven for 15–18 minutes.
Let cool to finish.