Baking with wholemeal flour

In the attempt to improve the nutritional values of my baking, I bought some wholemeal flour the other day and incorporated it into a muffin recipe. It's a really versatile recipe that allows you to add different ingredients to make it your own.
Muffins turn out so perfect. The wholemeal flour adds a slightly course texture and these muffins have more "bite" than the ordinary ones. Great for on-the-go breakfast! Adapted from Best Ever Muffins from allrecipe.com

1.25 cups all-purpose flour
0.75 cup wholemeal flour
3 tsp baking powder
1/4 cup pack brown sugar
1 egg
1 cup milk
30mL olive oil
1 tsp cinnamon
Frozen mixed berries

1) Preheat oven to 200 degrees C
2) Stir together flour, baking powder and sugar. Make a well in the centre. In a separate bowl, beat egg with a fork. Stir in milk and oil. Pour the liquid at once into the well in the flour mixture. Mix quickly and lightly with a folk until moistened. Foil in berries. Do not overbeat or the batter will be lumpy.
3) Pour batter into prepared muffin cups.
4) Bake for 25 minutes or until golden.