Preheat oven to 375°F (190°C). Combine the flour, ancient grain, sugar, baking powder, baking soda, salt, and cinnamon; set aside. Place egg, oil and juice in the blender. Cut 1/2 inch off each end of orange and discard. Quarter orange, cut and discard the inner core and pits. Cut each quarter into 3 smaller pieces. Add to blender one at a time, blend until smooth. Pour over dry ingredients and stir until just combined. Gently fold in cranberries. Spoon into greased muffin cups. Bake 15-20 minutes or until done. Remove from pan and cool on wire rack.
*For a softer muffin, pre-soak 1 cup ancient grain blend in ¾ cup orange juice for 30 minutes. Add this mix to dry ingredients. Continue with recipe as above, with only egg, oil and orange in the blender.