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School Cake recipe by Baking with Granny. Sponge cake with white icing and rainbow sprinkles.

School Cake

The original School Cake - a simple sponge cake, topped with a thick layer of white icing and a generous amount of rainbow sprinkles. Best served with custard (pink or otherwise!).
Author: Amy Reid
5 from 71 votes
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Course: Dessert
Cuisine: British, Scottish
Prep Time: 20 minutes
Cook Time: 40 minutes
Total Time: 1 hour
Servings: 12

INGREDIENTS
 

INSTRUCTIONS

  • Pre-heat your oven to 180°c (160°c for fan-assisted ovens, Gas Mark 4 or 350°F) and a 9x12 inch baking tin with greaseproof paper. Set aside.
  • In a large bowl, cream together the margarine and sugar until light and fluffy.
  • Add the eggs one at a time, ensuring each is mixed through before adding the next.
  • Sift in the flour and gently fold to create a batter.
  • Transfer the batter to your pre-lined tin and bake in your pre-heated oven for 30-40 minutes until risen, golden, and a skewer inserted comes out clean.
  • Leave to cool in the tin for a few minutes before transferring to a wire rack to cool completely.
  • Once your cake has cooled completely, mix the icing sugar with a few teaspoons of boiling water in a bowl, adding a little water at a time until you have a thick pouring consistency. Pour the icing onto your cake, using a spoon to guide it to the edges. Finish with some rainbow sprinkles.

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IMPORTANT NOTE:

All my recipes are developed using a digital scale and the metric system (grams and millilitres). Cup measurements are available as a conversion but these, unfortunately, won't always be as accurate. For best results, I always recommend baking with a digital scale.

NOTES

Egg Size:

When it comes to eggs, I always buy mixed-weight free-range eggs. Generally speaking, egg size doesn’t make a huge difference in most baking, unless you are using sizes that lean towards the extremes. If you're unsure which eggs to use, I recommend medium eggs in the UK, which are roughly equivalent to large eggs in the US. That's what this recipe has been tested with.

Self-raising Flour:

Don't have self-raising flour? For this recipe, simply whisk together 280g (2¼ cups) plain flour and 3¾ teaspoons baking powder instead. If you bake regularly, you can also make a larger batch to keep in your baking cupboard. For full instructions, cup conversions and answers to common questions, see my Self-raising Flour Ingredient Guide.

Substitutions:

  • Margarine: I use a soft baking margarine in most of my sponge cakes because I find it easier & more predictable to use, while always giving a light, moist crumb to your cake. You can swap this out for butter if you prefer, but make sure you use a soft butter for the best results.
  • Caster Sugar: When it comes to sponge cakes, caster sugar is preferable as the finer consistency is ideal for mixing through the batter. In a pinch, you could swap it for granulated sugar. For more information, see my Caster Sugar Ingredient Guide.

Storage:

Store your old School Cake in an airtight container at room temperature. It’ll keep well for up to 4-5 days, if it lasts that long!

Freezing:

You can freeze the sponge, but this is best done before adding the icing and sprinkles. Wrap the cake tightly in cling film and foil, and freeze for up to 3 months. Defrost at room temperature, then finish with the icing and sprinkles before serving.

Serving:

For full school-dinner nostalgia, serve with a drizzle of custard (pink or otherwise!).

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