Follow these simple steps to create your delicious No Sugar-Added Mini Blueberry Banana Muffins:

1. Preheat Oven: Preheat your oven to 350°F (175°C), and prepare a mini muffin tin by greasing it with cooking spray or lining it with paper liners.
2. Mix Dry Ingredients: In a medium bowl, whisk together the whole wheat flour, baking soda, baking powder, cinnamon, and salt.
3. Combine Wet Ingredients: In a large bowl, mix the mashed bananas, applesauce, Greek yogurt (if using), and vanilla extract until well blended.
4. Combine Mixtures: Gradually add the dry mixture to the wet ingredients, stirring just until combined. Avoid overmixing; it’s okay if some lumps remain.
5. Fold in Blueberries: Gently fold in the blueberries, ensuring an even distribution throughout the batter.
6. Fill Muffin Tin: Spoon the batter into each muffin cup, filling them about 2/3 full to allow for rising.
7. Bake: Place the muffin tin in the preheated oven, and bake for 15-20 minutes, or until a toothpick inserted into the center comes out clean.
8. Cool: Once baked, remove the muffins from the oven and allow them to cool in the tin for about 5 minutes. Then, transfer them to a wire rack to cool completely.

These straightforward steps will help you create Mini Blueberry Banana Muffins that are not only healthy but also absolutely delicious!