Rainbow Cake In A Jar - Perfect Mother's Day Treat !

Rainbow Cake In A Jar - Perfect Mother's Day Treat !

Posted by The Wares Team on 11th Mar 2019

Cooking in jars is becoming more and more popular, there are lots of recipes out there. This is a fun recipe for children or children at heart and perfect to make for Mother's Day.

Rainbow Cake Recipe In A Jar


  • 100g butter, unsalted and at room temperature
  • 100g caster sugar
  • 2 eggs, lightly beaten
  • 100g self-raising flour
  • 6 different shades (personal choice) of food colouring

For the buttercream topping:

  • 100g butter, unsalted and at room temperature
  • 200g icing sugar
  • sprinkles, smarties or other cake decorations

The quantities given make one cake in a 500ml jar, but you could easily split into two 250ml jars.


Preheat the oven to 180⁰C. Cream the butter and sugar together until pale and fluffy, then keep beating as you add the eggs gradually, breaking in with a spoonful of flour occasionally to avoid the mixture curdling. Fold in the rest of the flour. Split the mixture into six small bowls, or as many as you have food colours.

Add the food colours drop by drop to each bowl, stirring in thoroughly until the colour is uniform.  As the mixture bakes the colours will darken so don't be tempted to add too much.

Assemble the rainbow layers by spooning the first colour into the jars, making sure you don't touch the sides.  Spread the mixture evenly over the bottom of the jar with a teaspoon.  Repeat the same process for each colour.

Place the jar, left open, in a baking tin filled with about 3cm of water to keep the cake moist.  Cook in the centre of the oven for about 40-50 minutes.  The cake is ready when a skewer inserted into the centre comes out clean. Remove from the oven and allow to cool completely.

Make the buttercream by beating the icing sugar into the butter until fluffy and light.  Spread it over the top of the cake and decorate with your sprinkles and smarties. Decorate your jar with ribbon and a label to serve.

Please note: Wares of Knutsford Limited offers this recipe as a suggestion but cannot be held responsible for the effects of using jars in hot ovens.  Glass items sold on this website are manufactured for commercial use and any usage of these products in a domestic environment is at the customers own risk. Our products are stored in a non-sterile warehouse environment and Wares of Knutsford would therefore recommend that customers must sterilise all glassware before use. Wares of knutsford cannot be held responsible for any damage or injury caused by usage of glass products or any other items sold on this website.