Preheat oven to 350°F and grease a 9x5x3 loaf pan (or grease muffin tins or grease 4 mini loaf pans). If making a loaf, then also line the loaf pan with a slip of parchment paper, leaving an overhang on the sides to easily lift out the finished loaf.

Cream together butter and sugar until well blended, about 2 minutes. Mix in the vanilla and yogurt. Mix the eggs in one at a time, beating well after each one. Lastly, beat in the banana. Once everything is incorporated, set this aside.

In a separate bowl, whisk together both cups of flour, baking soda, salt and cinnamon together. Then add to wet mixture. Mix together until just combined. Fold in the walnuts (or chocolate chips).

Bread directions: Pour mixture into loaf pan. Bake 50-60 minutes or until toothpick comes out of center clean. Cool in pan on a cooling rack until completely cooled. Then remove the loaf from the pan and slice using a sharp, serrated knife.

Mini Loaves (pictured at top): Pour batter into greased mini loaf pans and bake for 33-38 minutes, or until a toothpick inserted into the centers come out clean. Place the loaf pans onto a wire rack to cool completely.