Combine almond flour, brown rice flour, baking powder, and salt in a bowl.
Add cold unsalted butter and mix by hand until crumbly.
Add almond milk and erythritol, mix to form a dough, then fold in sliced almonds.
Shape the dough into a round, flatten it, and cut into triangles.
Bake in a preheated oven at 180°C for 20-25 minutes.