Preheat the oven to 350 degrees and lightly coat an 8x4 bread pan with nonstick spray. Set aside.
Whisk together the milk and vinegar, and set aside.
Whisk together the flour, baking soda, and spices in a small mixing bowl. In a larger mixing bowl, cream together the butter and sugar with a hand mixer, then add in the bananas, milk/vinegar, and vanilla. Mix just until blended.
Slowly add the dry ingredients, again being careful not to overmix. Gently fold in the blueberries then pour the batter into the bread pan. Bake for 50-60 minutes or until a toothpick comes out clean.