In a large mixing bowl, combine oat flour, ground cinnamon, apple cider vinegar, softened grass-fed butter, and your choice of maple syrup or honey. Mix until a soft dough forms.

On a lightly floured surface, roll out the dough into a rectangle approximately ½ inch thick. Evenly spread the frozen organic blueberries across the surface of the dough.

Carefully roll the dough into a tight log, sealing in the berry filling.

Use a sharp knife to cut the log into equal slices, about 1-2 inches thick, and place in a greased baking dish.

Preheat your oven to 350°F and transfer the baking dish to the oven. Bake for 18-22 minutes, until golden brown.

Remove from oven and let cool in the dish for about 5-10 minutes before serving.