Preheat oven to 400°F. Spray a 16-cup muffin tin with nonstick spray.
Place 1⅔ cups quick cooking oats in a food processor and pulse until the oats resemble a coarse meal. Transfer the processed oats to a large bowl.
Measure and set aside the 2 tablespoons all-purpose flour for the blueberries. To the large bowl with the oats add 2/3 cup all-purpose flour, 1/2 cup whole wheat flour, 3/4 cup packed light brown sugar, 2 teaspoons ground cinnamon, 1 teaspoon baking powder, 1 teaspoon baking soda, and 3/4 teaspoon salt. Whisk the dry ingredients until evenly combined.
In a separate bowl, whisk together 1½ cups low fat buttermilk, 1/4 cup canola or vegetable oil, 2 teaspoons grated lemon zest, and 2 large eggs until blended.
Pour the wet ingredients into the dry ingredients and stir just until the dry ingredients are incorporated and the batter is moist (do not overmix).
In a medium bowl, toss 2 cups fresh blueberries with the reserved 2 tablespoons all-purpose flour until the berries are lightly coated.
Gently fold the floured blueberries into the batter, taking care not to crush the berries.
Spoon the batter into the prepared muffin cups, dividing it evenly among the 16 cups.
Sprinkle the tops of the muffins with the 2 tablespoons granulated white sugar.
Bake for 18 to 22 minutes, or until a toothpick inserted into a muffin comes out clean. Let the muffins sit in the pan for about 5 minutes, then transfer to a wire rack to cool.