Preheat your waffle iron.
In a large bowl, whisk together white whole-wheat flour, all-purpose flour, cornstarch, baking powder, baking soda, and salt.
In a medium bowl, whisk together eggs, buttermilk, milk, maple syrup, and vanilla. Whisk in the melted butter until well combined.
Pour the wet ingredients into the dry and whisk or stir until just combined. Set aside for 10-15 minutes while the waffle iron preheats.
Once waffle iron is heated, stir mini chocolate chips into the waffle batter. Lightly spray waffle iron with cooking spray. Cook waffles according to manufacturer's instructions. Serve immediately or keep warm in a 200 degree oven while you cook the rest of the waffles; serve.