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Amazing Mary Berry Chocolate Cake in 1 Hour

By sophie on May 9, 2026

A slice of moist single layer chocolate cake, topped with rich chocolate frosting and colourful sprinkles, inspired by Mary Berry.

Oh, there’s just something magical about pulling a perfectly moist chocolate cake out of the oven, isn’t there? Especially one that looks as impressive as this Single Layer Chocolate Cake Inspired by Mary Berry, but is actually a total doddle to make. I actually whipped this one up last Saturday when my mum popped round unexpectedly, and honestly, her face when she saw it was priceless! It’s got that lovely, rich flavour and a texture that just melts in your mouth. It’s become my go-to when I fancy something a bit special without all the fuss.

Why You’ll Love This Single Layer Chocolate Cake Inspired by Mary Berry

  • It’s an absolute doddle to make, perfect for even the most nervous of bakers!
  • The cake is incredibly moist and rich, with that gorgeous deep chocolate flavour we all adore.
  • It’s inspired by the legend herself – Mary Berry, so you know it’s going to be good!
  • The silky chocolate frosting is just divine and elevates the whole cake.
  • It’s quick too, so you can be enjoying a slice with a cuppa in less than an hour.
  • Perfect for small celebrations, birthdays, or just because you fancy a treat.

Ingredients for Your Single Layer Chocolate Cake Inspired by Mary Berry

Right then, let’s get down to the nitty-gritty! You’ll find all the bits and bobs you need for this absolute gem right here. Trust me, using good quality ingredients really makes a difference, but don’t fret if you don’t have everything – most of these are pretty standard pantry staples. And yes, that link is for another Mary Berry chocolate cake recipe, just in case you’re feeling inspired to bake even more! Check out this one too!

  • 65 g plain flour
  • 50 g caster sugar
  • 50 g light brown sugar
  • 25 g cocoa powder
  • 1 tsp baking powder
  • 1/4 tsp bicarbonate of soda
  • 1/8 tsp salt
  • 1 medium egg
  • 60 ml whole milk
  • 2 tbsp vegetable oil
  • 1 tsp vanilla extract
  • 2 tbsp hot water
  • 30 g dark chocolate, melted
  • 1/2 tsp instant coffee powder

For the Frosting:

  • 70 g milk chocolate
  • 85 g unsalted butter, softened
  • 40 g icing sugar, sifted
  • 25 g cocoa powder
  • 1/8 tsp salt
  • 2 tbsp golden syrup
  • 1 tsp vanilla extract
  • Rainbow sprinkles for decorating

Step-by-Step Instructions for Your Mary Berry-Inspired Chocolate Cake

Right then, let’s get down to the nitty-gritty! You’ll find all the bits and bobs you need for this absolute gem right here. Trust me, using good quality ingredients really makes a difference, but don’t fret if you don’t have everything – most of these are pretty standard pantry staples. And yes, that link is for another Mary Berry chocolate cake recipe, just in case you’re feeling inspired to bake even more! Check out this one too!

  1. First things first, let’s get that oven humming! Pop it on to 180°C (or 160°C for a fan oven, mind). Then, take your 15cm round cake tin, give it a good grease, and pop a circle of baking paper in the bottom. That’ll stop any sticking!
  2. Next, we need to melt the dark chocolate. I usually do this in a heatproof bowl over a pan of barely simmering water, or you can do it in short bursts in the microwave, stirring in between until it’s all smooth and glossy. Let it cool a *tiny* bit before we use it.
  3. Now for the dry bits! Grab yourself a medium bowl and whisk together the plain flour, caster sugar, light brown sugar, cocoa powder, baking powder, bicarbonate of soda, and a pinch of salt. Give it a good whisk so there are no lumps.
  4. In a separate little bowl, whisk up your egg, the milk, vegetable oil, and that lovely splash of vanilla extract. Oh, and that instant coffee powder? Stir it into the hot water – it really boosts the chocolate flavour, you know! Add this coffee mixture to your wet ingredients, along with that slightly cooled melted dark chocolate. Give it a little stir.
  5. Time to bring it all together! Pour your dry ingredients into the wet mixture and whisk gently. Honestly, don’t go mad mixing it – just until it’s combined and looks like a lovely, smooth batter. Overmixing can make it tough, and nobody wants that!
  6. Now, pour all that gorgeous batter into your prepared tin and just smooth the top over a bit. Pop it in the oven for about 25 to 28 minutes. The best way to tell if it’s ready is to pop a skewer right into the middle – if it comes out clean, bingo!
  7. Once it’s baked, leave the cake to cool in the tin for about 10 minutes. It needs a little rest before we rescue it! Then, carefully turn it out onto a wire rack to cool down completely. Patience is key here – you don’t want melty frosting on a warm cake!
  8. While the cake cools, let’s make that divine frosting. Melt the milk chocolate (same trick as the dark chocolate!) and let it cool slightly.
  9. In a mixing bowl, beat together the softened butter, sifted icing sugar, cocoa powder, and that tiny pinch of salt until it’s all light and fluffy. Then, add in the golden syrup, vanilla extract, and your cooled melted milk chocolate. Beat it all together again until it’s super smooth and creamy.
  10. Once your cake is completely cool, spread that lovely frosting all over the top with a palette knife. Finally, sprinkle on those rainbow sprinkles for a bit of fun! Slice it up and enjoy your masterpiece!

A slice of single layer chocolate cake inspired by Mary Berry, topped with chocolate frosting and colourful sprinkles.

Serving Suggestions for Your Single Layer Chocolate Cake

This cake is lovely all on its own, but here are a few little ideas to make it even more special:

A dollop of whipped cream: Just a simple swirl of softly whipped cream is perfect for cutting through the richness of the chocolate.

Fresh berries: A handful of fresh raspberries or strawberries adds a burst of freshness and a lovely colour contrast.

A light dusting of icing sugar: For a more classic look, a gentle dusting of icing sugar can be ever so elegant. Check out my easy chocolate chip brownie recipe too, if you fancy something a bit different!

A slice of single layer chocolate cake with rich chocolate frosting and colourful sprinkles, inspired by Mary Berry.

Storing and Reheating Your Chocolate Cake

Now, if you manage to have any leftover (which, let’s be honest, is a miracle in my house!), here’s how to keep it tasting just as scrumptious.

To keep your gorgeous cake fresh, the best way is to store it in an airtight container. If your kitchen isn’t too warm, you can leave it out on the counter for a day or two. But for longer storage, or if it’s a bit toasty, pop it in the fridge. It’ll keep nicely for about 3-4 days like this. Honestly, it’s great for sneakily having a slice with your afternoon cuppa!

Reheating isn’t really a big thing for this cake, as it’s lovely at room temperature or just slightly chilled. But, if you fancy a warmer treat, you can pop a slice in a low oven (around 150°C) for just a few minutes until it’s warmed through. Be careful not to overheat it, though!

Frequently Asked Questions About This Single Layer Chocolate Cake

Got a nagging question about our lovely Mary Berry-inspired cake? Don’t you worry, I’ve got you covered!

Can I use a different size cake tin?

You can, but you’ll need to adjust the baking time. If you use a larger tin (say, 20cm), the cake will be thinner and bake much faster, probably in about 18-20 minutes. If you use a smaller tin, it’ll be deeper and take longer, so keep an eye on it! Always do the skewer test to be sure. It’s always worth checking out other Mary Berry cake recipes too, like this Mary Berry chocolate cake recipe for comparison.

What if I don’t have light brown sugar?

No worries at all! If you haven’t got any light brown sugar, just use the same amount of caster sugar instead. The light brown sugar does add a lovely little bit of moisture and a slightly caramelly note, but it’ll still be delicious without it. Honestly, this recipe is quite forgiving!

Can I make this cake dairy-free or vegan?

You know, I haven’t personally tried making this specific cake dairy-free or vegan, but it’s a good question! For dairy-free, you’d need to swap the milk and butter. There are some brilliant dairy-free milks and plant-based butter alternatives out there that might work. For vegan, you’d also need to swap the egg – a flax egg or a commercial egg replacer could be worth a go! It might change the texture a bit, but it’s definitely worth experimenting if you fancy it. For a guaranteed vegan chocolate recipe, you could try looking at some other Mary Berry vegan recipes online!

Before You Go

Right then, give this delicious Mary Berry-inspired chocolate cake a whirl this week! I’d absolutely love to hear how you get on, so please do leave a comment below or rate the recipe if you try it. Happy baking, everyone!

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A slice of single layer chocolate cake with rich chocolate frosting and colourful sprinkles, inspired by Mary Berry.

Single Layer Chocolate Cake


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  • Author: sophie
  • Total Time: 48 minutes
  • Yield: 6 servings
  • Diet: Vegetarian

Description

A rich, moist single layer chocolate cake with silky chocolate frosting, perfect for small celebrations or weekend baking.


Ingredients

  • 65 g plain flour
  • 50 g caster sugar
  • 50 g light brown sugar
  • 25 g cocoa powder
  • 1 tsp baking powder
  • 1/4 tsp bicarbonate of soda
  • 1/8 tsp salt
  • 1 medium egg
  • 60 ml whole milk
  • 2 tbsp vegetable oil
  • 1 tsp vanilla extract
  • 2 tbsp hot water
  • 30 g dark chocolate, melted
  • 1/2 tsp instant coffee powder
  • 70 g milk chocolate
  • 85 g unsalted butter, softened
  • 40 g icing sugar, sifted
  • 25 g cocoa powder
  • 1/8 tsp salt
  • 2 tbsp golden syrup
  • 1 tsp vanilla extract
  • Rainbow sprinkles for decorating


Instructions

  1. Preheat your oven to 180C or 160C fan. Grease and line a 15 cm round cake tin with baking paper.
  2. Melt the dark chocolate in a heatproof bowl in short bursts in the microwave, stirring until smooth. Let it cool slightly.
  3. In a small bowl, whisk together the plain flour, caster sugar, light brown sugar, cocoa powder, baking powder, bicarbonate of soda, and salt.
  4. In a separate bowl, whisk the egg, milk, vegetable oil, and vanilla extract. Stir the instant coffee powder into the hot water, then add this to the wet mixture along with the melted dark chocolate.
  5. Add the dry ingredients to the wet ingredients and whisk gently until just combined and smooth.
  6. Pour the batter into the prepared cake tin and smooth the top. Bake for 25 to 28 minutes, or until a skewer inserted into the centre comes out clean.
  7. Let the cake cool in the tin for 10 minutes, then transfer it to a wire rack to cool completely.
  8. For the frosting, melt the milk chocolate until smooth and let it cool slightly.
  9. Beat the softened butter, icing sugar, cocoa powder, and salt until fluffy. Add the golden syrup, vanilla extract, and melted chocolate, then beat until smooth and creamy.
  10. Spread the frosting over the cooled cake using a palette knife. Finish with rainbow sprinkles before slicing and serving.

Notes

  • For an extra rich flavour, chill the frosted cake for 20 minutes before serving to slightly firm the chocolate topping.
  • Prep Time: 20 minutes
  • Cook Time: 28 minutes
  • Category: Dessert
  • Method: Baking
  • Cuisine: British

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