Lightly spray mini muffin tins with pam. Combine Yogurt, egg, oil, mashed bananas and blueberries in a large bowl.
In another bowl mix together your baking powder, salt, brown sugar, flour and cinnamon stirring until combined. Add dry mixture into wet mixture stirring until just moistened.
Spoon batter into muffin tins. Bake 15 minutes or until an inserted toothpick comes out clean.
Notes
Leave muffins in pan for 5 minutes. Take out of pan and place on a wire rack to cool completely. Serve warm or cold.