Pre heat oven to 180C and grease a medium sized loaf pan with butter. Set aside.
Sift together all the dry ingredients namely - whole wheat flour, all purpose flour, cocoa powder, salt, cinnamon, nutmeg powder and baking powder soda and set aside.
In a bowl of your mixer, cream together butter and sugar till light and fluffy. This will take about 3-4 minutes.
Now add egg one at a time, beating till it is fully blended.
Add the sour cream and beat further for a minute and fold in the flour mixture to it.
In the end fold in the strawberries and the chopped chocolate.
Pour the batter in the prepared pan and bake for 25-30 minutes till a toothpick comes out clean.
Wait for it completely cool before removing from the pan and slicing.