Preheat the oven to 400 degrees F. Grease your muffin pan and set aside.
In a large bowl, whisk the 2 flours, baking powder, flax seed, baking soda, cinnamon, and salt. In a separate medium sized bowl, mix the bananas, brown sugar, oil, vanilla, and egg with a whisk or fork. Once mixed, stir in the carrots and the prunes gently. Add this mixture to the flour mixture and fold until all ingredients are combined. Do not over mix.
Spoon the batter into the prepared muffin pan. Bake for about 23 minutes, or until toothpick inserted into the center of the muffin comes out clean. Remove the muffins from the oven, and serve warm.
For me - this made 6 large muffins, and 6 mini muffins (cupcake size). Enjoy!