Preheat oven to 356F (180C) and grease a mini muffin tin.
Add the cooked beets, coconut oil, banana and eggs to a blender and blend until smooth.
In a bowl, add the oat flour, flaxseed meal (or flour), cinnamon and baking powder and mix.
Pour content from blender to the dry ingredients bowl and combine.
Split the batter into 12 mini muffins or 6 regular sized muffins.
Bake until a toothpick comes out clean, about 15 minutes for minis and 20 minutes for regular sized muffins.