Preheat the oven to 180°C (350°F) and line a baking tray with parchment paper.
In a large bowl, mix the oats, whole wheat flour, cocoa powder, brown sugar, baking powder, a pinch of salt, chopped hazelnuts, and chocolate chunks.
Add the oil and milk, then stir until a dough forms.
Transfer the dough onto a sheet of parchment paper on the counter and flatten it with a rolling pin.
Use cookie cutters to cut out your desired shapes and place them on the prepared tray.
Bake for 22-25 minutes, until the cookies are firm around the edges.
Let them cool completely before enjoying.
