Beat the coconut oil or butter and sugars until smooth.
Beat in the bananas , vanilla, and lemon juice.
Whisk the dry ingredients together, and mix into the banana mixture until smooth. Batter should be a very typical quick bread consistency, thick enough to have to coax it out of the bowl and into the pan. Add a bit more flour if needed.
Pour into prepared pans, bake until golden brown and knife inserted in middle comes out clean: about 50 minutes for a large loaf pan, 30 minutes for a mini loaf pan, or 18-20 minutes for muffins.