Preheat the oven to 350 degrees F. Butter a 9 x 5 inch loaf pan and set aside.
In a medium bowl, mix together the flour with salt, baking powder and the baking soda.
In a large bowl, cream the butter with the sugar. Mix in eggs, mashed bananas, Greek yogurt and vanilla. Add the flour and mix well. Now gently fold in the blueberries.
Transfer the batter into the loaf pan.
Bake for about 1 hour, or until a toothpick inserted in center comes out clean. Start checking for doneness at about 50-55 minutes. If you want to a nicely browned, crispier top, finish baking on convection, for about 10 minutes at 325F.
Let cool completely before slicing and serving.