100% Whole Wheat Blueberry Muffins

Preheat oven to 350.
Coat 12 muffin cups with cooking spray.
Sift together the flour and baking soda.
In a separate bowl, whisk together the buttermilk, egg whites, oil, and honey until creamy, then stir in the blueberries.
Pour the wet ingredients into the dry.
Fold together with a rubber spatula until the batter is moist yet remains slightly lumpy.
Pour into muffin cups and bake 30 to 35 minutes.