Preheat the oven to 180°C (356°F).
In a bowl, mix whole wheat flour, baking powder, cocoa powder, and salt.
Add cold butter and mix with your fingertips until it resembles coarse crumbs.
Finely chop the walnuts and dark chocolate, then add to the mixture.
Add soy milk and oligosaccharide syrup, then bring the dough together.
Flatten the dough and cut it into triangles.
Place on a parchment-lined baking sheet and bake for 20 minutes.