Mix the flours and the baking powder and set aside.
Cut the orange into wedges. Peel the wedges and set the filet pieces aside.
Whisk the egg and the pinch of salt in a big bowl.
Add the bananas and keep mixing.
Then add the oil and Kefir.
Once the wet ingredients are well combined, add the flour mix. You can use the mixer or a spatula to mix it all together.
Then add the chia seeds.
Distribute the dough into the muffin tin.
Bake in a pre-heated oven at 180 degrees Celcius for 35 minutes.
Leave to cool in the tin, then store them in an airtight container overnight. Enjoy them the next day!