Preheat your oven to 400°F (200°C). Grease a baking pan.
In a large mixing bowl, combine cornmeal, flour, sugar, baking powder, and salt.
In another bowl, whisk together milk, vegetable oil, and beaten eggs.
Pour the wet ingredients into the dry ingredients and stir until just combined.
Gently fold in the blueberries.
Pour the batter into the prepared baking pan.
Bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
Let cool before slicing and serving.