Preheat your oven to 350F while you prepare the batter.
In a large bowl, whisk oat flour, cacao powder, coconut sugar, flax seeds, baking powder and salt.
Add pecan butter, maple syrup and vanilla.
At this point, the dough should be moist enough to fold in chocolate chips and marshmallows. If not, add non-dairy milk by the teaspoon.
Finally, fold in chocolate chips and marshmallows.
Roll 1 ½ tbsp of dough into balls and press down onto a lined baking tray. Make the cookies a little larger than you normally would, so that each cookie gets enough chocolate + marshmallow goodness.
Bake for about 10-11 minutes, until tops of cookies are golden and marshmallows are lightly toasted.