Preheat the oven to 180°C (350°F) and cover a baking sheet with waxed paper.
Mix the dry ingredients: oat flour, cocoa powder, baking soda and salt. Set aside.
Cream the vegan butter or coconut oil with the sweetener until creamy.
Add the vanilla and mix well.
Fold the dry ingredients into the wet mixture and integrate.
Add the oat milk little by little until a soft dough is obtained.
Roll out the dough on a lightly floured surface and use a small round cutter to make the cookies. Place them on the prepared tray.
Bake the cookies for 10-12 minutes, until firm. Let them cool completely on a wire rack.
While the crackers are cooling, beat the vegan cream cheese or tofu with the powdered sugar and vanilla until smooth and creamy.
Place a spoonful of the filling on one cookie and cover it with another, pressing lightly so that they adhere.