Whole wheat sponge cake (Eggless)

This is a quick recipe to make a healthy snack for the hungry kids at home. I make it very often and my son loves it. I've made this cake as a tea snack for a few get togethers as well and its been a hit.
Here's the recipe. Enjoy !

What do I need??

1 and half cup whole wheat flour
3/4 cup sugar
1/2 cup oil
1 cup curd/buttermilk
1 teaspoon vanilla essence
1 teaspoon baking powder
1/2 teaspoon baking soda
Chopped almonds or walnuts (optional)
A pinch of salt

What are the steps??

1. First we need to preheat the oven at 180 degree Celsius. 
2. Dust a baking tin with butter and flour or line it with butter paper and keep it ready. 
3. Mix curd and sugar well until sugar dissolves completely.
4. Now add oil and vanilla essence and mix it all well together
5. Sieve wheat flour, salt, baking powder and baking soda to avoid lumps.
6. Now fold the flour into the wet mixture slowly. Add the chopped nuts to it as well.
7. Pour the batter into the baking tin.
8. Bake the cake on 180 degree celcius for 35-40 mins.

Any tips??

1. If the mixture becomes too thick, add some milk to get batter consistency.