Preheat oven to 400°F. Line a muffin tin with 12 muffin liners.
In a large bowl, combine mashed bananas, honey, eggs, vanilla extract, salt, and melted coconut oil.
In a separate bowl, combine baking powder, oat flour*, and oatmeal. Fold the dry ingredients into the wet, mixing until just combined.
Gently fold in blueberries, then scoop batter evenly into 12 prepared muffin liners. Bake for 5 minutes at 400°, then turn heat down to 350° and bake for an additional 12 minutes.
Allow muffins to cool slightly before removing from muffin tin. Serve warm or cold! Can be kept for up to 5 days in the fridge, or for months in the freezer!