Preheat the oven to 350°F. Line a 9”x5” pan with parchment paper (or grease with butter and lightly dust with flour to prevent sticking). In a bowl, combine flour, baking powder, baking soda and salt.
In a separate bowl, on high speed, beat together the sugar and eggs until mixture is fluffy.
In a small bowl, combine the sour cream and vinegar and add to the egg mixture with the oil and vanilla; beat on low just until combined. Fold in the mashed bananas with a spatula.
Add the flour mixture and beat on low just until flour is incorporated.
Add the blueberries in a separate bowl and toss with 2 tsp flour.
Pour about ¼ of the batter into the pan, add about ¼ of the blueberries. Continue until all the batter and blueberries are in the pan, leave some blueberries to add to the top of the batter for decoration. DON’T mix blueberries in with the batter or your loaf will become blue.
Bake for 45-55 minutes or until a toothpick inserted into the center comes out clean.
Slightly cool bread in the pan, then transfer to a wire rack to cool completely.
Serve and enjoy, friends!