1. Preheat the oven to 325 degrees F 2. Using your electric mixer with the whisk attachment, add the mashed banana, sugar and yogurt. Mix until incorporated. 3. Add melted butter, eggs and vanilla extra and mix. 4. Add flour, baking powder, baking soda and salt to the batter and mix until just incorporated. Do not over mix! 5. Using a spatula, fold in the chocolate chips or blueberries*. 6. Scoop the batter into piping bag, snip the end to leave an opening 7. Grease your doughnut baking pan and pipe 3/4 full the batter into each doughnut mold. 8. Optional: Sprinkle cinnamon sugar mixture on top of each doughnut batter before baking. 9. Bake for 12 to 15 minutes. Remove from the pan and allow to cool before eating. *Tip: toss blueberries in 1-2 tablespoons flour, to prevent them from sinking to the bottom. Topping (Optional): Cinnamon Sugar (I used the Domino shaker)