Preheat oven to 425°F. Line two 12 count muffin tins with paper liners or grease with non-stick cooking spray. Set aside.
In a medium bowl, combine the flour, baking powder, baking soda, cinnamon and salt. Set aside.
In a large bowl, cream together the butter, white sugar, and brown sugar until light and fluffy. Slowly beat the egg, vanilla, and yogurt into the butter mixture.
Add the flour mixture into the butter mixture and beat until just combined. Gently fold in the mashed banana, followed by the strawberries.
Spoon batter into prepared tin, filling each until about ¾ of the way full.