Preheat the oven to 375 °F. Line a muffin tins with enough for 6-8 muffins.
In a large bowl, whisk together oat flour, baking soda, baking powder and salt.
In a medium bowl, combine maple syrup, oil, mashed banana, eggs and vanilla.
Pour the wet ingredients into the dry and mix until just combined.
Fill the prepared muffin tin liners nearly full. Bake for 18-22 minutes until a toothpick poked in the center comes out mostly clean or the centers bounce back when lightly pressed.
Allow to cool in tins for 5 minutes and then remove to a wire rack to allow to cool completely.
Notes
LeftoversCool leftover muffins completely and store in an airtight container in the refrigerator for up to 3 days or freeze for up to 3 months.Mini MuffinsLine a mini muffin tin for 24-30 muffins and fill liners nearly full. Bake for 10-12 minutes.