Preheat the oven to 400 degrees. Grease a 12-muffin pan, or use paper liners. Combine the dry ingredients. In a small mixing bowl, mix the egg, milk, and oil. Make a well in the flour mixture, pour in the egg mixture and blueberries. Stir until the flour mixture is moistened, the batter will be lumpy. Fill the muffin cups 2/3 full. Bake for 20-25 minutes or until golden brown.