Preheat Oven and Grease Pan:
Heat oven to 356°F (180°C). Coat a mini muffin tin with grease.Blend Beets and Wet Ingredients:
In a blender, put cooked beets, coconut oil, banana, and eggs; process until smooth.Mix Dry Ingredients:
In a separate bowl, mix oat flour, flaxseed meal, cinnamon, and baking powder with a whisk.Combine Wet and Dry Mixtures:
Add the blender mixture to the dry ingredients; stir until just incorporated.Fill Muffin Cups:
Distribute batter into 12 mini muffin cups (or 6 standard ones).Bake Until Done:
Bake until a toothpick inserted into the center emerges clean: roughly 15 minutes for mini muffins, 20 minutes for regular.