01 -
Preheat the oven to 350°F (175°C). Grease a 24-cup mini muffin pan or use a silicone mini muffin pan.
02 -
Add the cooked beets, bananas, eggs, yogurt, oil, and vanilla to a blender. Blend until completely smooth and bright pink.
03 -
In a medium bowl, whisk the oat flour, whole wheat flour, ground flaxseed if using, baking powder, and cinnamon until evenly combined.
04 -
Pour the beet mixture into the dry ingredients. Fold gently with a spatula just until no dry flour remains. Do not overmix.
05 -
Divide the batter among the mini muffin cups, filling each about three-quarters full.
06 -
Bake for 13-15 minutes, until the tops spring back lightly and a toothpick inserted in the center comes out clean. Cool in the pan for 5 minutes, then transfer to a rack and cool fully before serving.