In a medium bowl or a large measuring cup, whisk together the vegetable oil, non-fat plain Greek yogurt, milk, eggs, and vanilla extract until fully combined. Pour the wet ingredients into the large bowl over the dry ingredients. Add in the balsamic reduction making sure to get the thick syrup coating the bottom of the pan, and using a wooden spoon, stir until the batter begins to come together, leaving just a few clumps or bits of flour visible. Fold in the floured blueberries.