Preheat oven to 350°F. Grease an 8x8 inch baking dish or line with parchment paper.

In a medium mixing bowl, combine the pancake mix, egg, milk, Greek yogurt, maple syrup, and vanilla. Stir until just combined, being careful not to overmix.

Gently fold in the blueberries.

Pour the batter into the prepared baking dish and spread evenly.

Bake for 26 to 30 minutes, checking around 26 minutes, until the top is lightly golden and a toothpick inserted into the center comes out clean or with a few moist crumbs.

Allow to cool for 10 to 15 minutes before slicing into 12 bars.