Easy School Cake Recipe

School cake brings back the sweetest memories, doesn’t it? I still remember those days when the lunch ladies would slice up huge trays of this golden sponge topped with pink icing and rainbow sprinkles. My kids, Isabella, Emma, and Noah, go absolutely wild for this cake, and honestly, Henry and I are right there with them sneaking extra slices after dinner.

This old fashioned school cake is everything you want in a simple traybake: fluffy, buttery sponge with that signature sweet icing on top. It’s the kind of recipe that makes you feel like a kid again with every bite. The best part? You probably have all the ingredients sitting in your pantry right now. No fancy techniques, no complicated steps just a straightforward British school cake that delivers pure comfort and nostalgia every single time.

If you’re looking for more easy dessert recipes that bring the whole family together, you’ll love my traditional Christmas cookies recipe that’s perfect for holiday gatherings!

Why You’ll Love This School Cake Recipe

• Super simple ingredients margarine, eggs, flour, and sugar are all you need
• Ready in under an hour from start to finish including cooling time
• Feeds a crowd perfect for bake sales, parties, or just because
• Kid-approved my three little taste-testers give it two thumbs up every time
• Customizable icing add food coloring or different sprinkles to match any occasion
• Freezer-friendly make ahead and ice when you’re ready to serve

Ingredients You’ll Need for This Classic British Traybake

For the sponge:

• 280g margarine (at room temperature this is key for a fluffy texture)
• 280g caster sugar (superfine sugar works beautifully)
• 5 free-range eggs (room temperature eggs mix better)
• 280g self-raising flour (the magic ingredient for that perfect rise)

For the icing:

• 350g icing sugar (powdered sugar for that sweet, smooth topping)
• 3-4 tbsp boiling water (add gradually for perfect consistency)
• Rainbow sprinkles (optional but absolutely recommended for that authentic school cake look)

You can definitely swap the margarine for butter if you prefer – it’ll give you a slightly richer flavor that’s absolutely delicious. I’ve made it both ways and honestly, my family devours it either way!

How to Make the Perfect School Cake

Prep your oven and tin: Start by preheating your oven to 180°C (160°C fan, Gas Mark 4, or 350°F). Line a 9×12 inch baking tin with greaseproof paper. Trust me, lining it properly saves you so much hassle later.

Cream the margarine and sugar: In a large bowl, beat together the margarine and caster sugar until the mixture is light, fluffy, and almost pale in color. This usually takes about 3-4 minutes with a wooden spoon (or 2 minutes with an electric mixer if you want to save your arm).

Add the eggs one at a time: This is important add each egg individually and mix it through completely before adding the next one. This prevents the batter from splitting and keeps everything smooth and gorgeous. If it does start to look a bit curdled, don’t panic! Add a tablespoon of flour and it’ll come right back together.

Fold in the flour: Sift the self-raising flour over your batter and gently fold it in with a large spoon or spatula. Use a figure-eight motion and be gentle you want to keep all that air you just beat in there. The batter should be thick but still drop easily from your spoon.

Bake to golden perfection: Pour the batter into your prepared tin and spread it evenly to the corners. Pop it in the oven for 30-40 minutes. You’ll know it’s done when it’s risen beautifully, turned golden brown, and a skewer inserted in the center comes out clean (or with just a few crumbs).

Cool completely: This is the hardest part because it smells amazing! Let the vanilla traybake cake cool in the tin for about 10 minutes, then transfer it to a wire rack to cool completely. If you try to ice it while it’s warm, the icing will just slide right off – I learned that lesson the hard way.

Make the signature icing: In a bowl, mix the icing sugar with boiling water, adding just a tablespoon at a time. You want it thick enough to coat the back of a spoon but still pourable. Pour it over your cooled cake and use the back of a spoon to guide it to the edges. Immediately add your sprinkles before the icing sets.

How to Store Your School Cake

Store your school cake in an airtight container at room temperature for up to 5 days. The icing creates a lovely seal that keeps the sponge moist and delicious.

For longer storage, freeze the cake BEFORE icing. Wrap it tightly in cling film and then foil, and it’ll keep perfectly for up to 3 months. Just thaw it at room temperature and add the icing when you’re ready to serve.

Delicious Variations to Try with Your School Cake Recipe

Chocolate school cake: Replace 50g of flour with cocoa powder and use chocolate sprinkles on top. Isabella requests this version for every birthday party.

Lemon drizzle version: Add the zest of 2 lemons to the batter and make the icing with lemon juice instead of water. It’s absolutely divine.

Coffee and walnut: Add 2 tablespoons of instant coffee dissolved in a tablespoon of hot water to the batter, plus 100g chopped walnuts. Top with coffee-flavored icing.

Funfetti celebration cake: Stir 100g of rainbow sprinkles into the batter before baking for a party-ready version that makes every day feel special.

School Cake Recipe FAQs

Final Thoughts

This easy sponge traybake is hands down one of the most requested recipes in my house. Whether you’re baking for a school event, a family gathering, or just because you want something sweet and comforting, this school cake recipe delivers every single time.

The beauty of this recipe is in its simplicity – no fancy ingredients, no complicated techniques, just honest, delicious baking that brings people together. Every time I make this cake, I’m transported back to those primary school lunch halls, and now I get to create those same happy memories for my own kids.

More Delicious Traybake Recipes You’ll Love

• Best Gingerbread Cookie Bars another easy traybake that’s perfect for sharing
• Snickerdoodle Blondie Bites sweet, cinnamon-sugar treats the whole family adores
• Blueberry Cheesecake Cookies when you want something a little fancier but still super easy

Happy baking

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