Why didn't I think of that!

I often spend hours in bookstores going through cook books, getting ideas and inspiration, memorizing recipies and looking at pictures. Then influenced by this I like to improvise at home. This Saturday I found a book about baking cakes in jars. The book was so cute and had such nice ideas that I couldn't resist buying it.
Basically it's possible to put almost any batter into a glass jar and bake it in an oven. Just close the lid well when the cake is still hot and it'll last two months in your cupboard, ready for an unexpected guest! This also makes a great gift and I'm thinking of sending a chocolate one to Finland for my father's birthday. Hope he doesn't read this..!

Here's my first experiment:

Marble Cake

3 egg whites
3 egg yolks
pinch of salt
100 g soft butter
200 g sugar
1 teaspoon vanilla extract or vanilla sugar
1 tablespoon baking powder
100 ml milk
300 g flour
50 g dark cocoa powder


Grease 3 glass jars (I used 400 ml contets jars) and preheat oven to 180 °c or 350 F.
With an electric mixer beat egg whites and salt until hard and foamy.
In another bowl whisk egg yolks, butter, sugar and vanilla to a foamy texture.
Mix flour and baking powder together and add to the egg-butter mixture along with 75 ml milk. Carefully fold in eggwhites.
Move half of the batter into another bowl and add the rest of the milk and cocoa powder to one of the batter bowls. If the mixture is too dry and difficult to handle add more milk.
Fill glass jars half full in turns with the two batters. Bake for 45-60 minutes, until a toothpick comes out dry. Close immediately with a lid and store in a cool dark place.