Blend all the wet ingredients until smooth and pour into a bowl. Or mash the banana really well, then whisk the rest of the ingredients in.
Add the 1 1/4 cup flour and the rest of the dry ingredients, and mix well to combine. Add more flour a tbsp at a time to make a somewhat stiff batter. You can add some nuts, seeds, chopped dates or mini chocolate chips at this point and mix in.
Let the mixture sit for 5 mins. Grease the donut pan and pour the mixture into the pan (use a spoon or pour into a ziploc/pastry bag and pipe into the pan). Let sit for another 15 mins to rise.
Bake at 350 degrees F (175 C)for 18 to 20 mins. Cool for 5 mins then remove from the pan. Cool completely(cover by a light towel to cool). Glaze with chocolate glaze, or regular sugar icing, or cashew cream frosting and some toasted coconut. or toss in cinnamon sugar mixture.Store on the counter for the day, refrigerated for upto 4 days.
Notes
To make these gluten-free: Mix 1/3 cup white rice flour, 1/4 cup potato starch, 1 tbsp tapioca starch, 1 cup almond flour, and use. Once baked, cool under a towel. Make it yeastfree: Omit the yeast and make the batter. No need to let it sit after piping into the pan. You can also bake this yeastfree batter into muffins. Add a cinnamon streusel. Make these Oilfree: Use 2 tbsp applesauce and 2 tbsp nut butter.Nutrition is for 1 donut