Low fat Whole-wheat Banana-berry&Walnut Cake

This is the low fat and healthy version of the regular Banana-Walnut cake. I have used only egg whites, whole wheat flour, less sugar. Try it and you will definitely like it! :)
Ingredients
Whole wheat flour/Aata -11/4cup
Baking soda-1/2teaspoon
Cinnamon powder-1/2teaspoon
Vanilla extract-1/2teaspoon
Banana puree-1cup
Chopped walnut-1/2cup
Dried cranberries-2 tablespoons
Sugar-6tablespoons
Salt-1/4teaspoon
Softened Butter-4tablespoons(can replace it with canola oil)
Fat free milk-1/4cup
Egg whites from 2 large eggs
Note: Separate the eggs immediately after taking them from the fridge and then bring it to room temperature. Its easy that way.

Method
Pre heat the oven to 350F.
Sift together the whole wheat flour-baking soda-salt-cinnamon powder and keep it aside.
Cream the sugar and butter. Add the egg whites with vanilla extract, mix it.
Mash the bananas with the fork and keep it ready.

Add the dry ingredients with wet ingredients. Fold it gently.
Now add the chopped walnuts-banana puree and fold it.
Finally add in the dried cranberries and fat free milk, mix everything.

Pour the cake mix in a greased loaf pan and bake it for about 50 minutes. 

Open the oven, cover the pan loosely with an aluminum foil and continue baking for 10-15 more minutes(or) the till the cake is done.

Remove the cake pan and let it cool for half an hour. Run a knife on the edges of the pan carefully and remove the cake, let it cool on a wire rack for 2 hours. 

Slice the cake and enjoy! It tastes better the next day!