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Our favourite British traybake treat is such a comforting snack, but with so many different ways to make it, it can be tricky to master.

I am happy to say there IS a foolproof way to make Flapjacks that works every single time. In just 6 ingredients and 20 minutes in the oven, you have a chewy, sticky classic goodie – I’m letting you in on the secret to the ultimate recipe!

Squares of flapjack drizzled with melted chocolate on baking paper.

Learning how to make Flapjacks is a rite of passage and once you’ve found the right recipe, you’ll be turning to it again and again for breakfast-on-the-go option or a packed lunch sweetener, or just because there’s a cup of tea going that needs an accompaniment.

There are so many different ways to make flapjack but I am VERY happy to report that I have done the testing and experimenting on this classic snack so you don’t have to.

This is the ultimate FOOLPROOF flapjack recipe that works. Every. Single. Time. There’s a secret to it too… shhh (but it lies within the oats you use) 🤫

Why you’ll love this Simple Flapjack recipe

⭐️ Only 6 ingredients

⭐️ No faff or fancy equipment needed

⭐️ Energy-packed snack for busy kids (and grown-ups)

A chopping board filled with squares of chocolate-covered flapjacks.

A note on oats

After making this many batches of homemade flapjacks over the years, I noticed something about the oats I used. (No exaggeration – I can safely say the success of your baking lies in the type of oats you use!) Once I realised this, there was no going back for me. 

💥 HERE IS THE SECRET 💥… I use half rolled oats and half jumbo oats. 

Rolled oats are more likely to be used in porridge. They absorb moisture well and carry flavours. Jumbo oats tend to be bigger and crunchier, keep their shape more, and are more likely to be used for biscuits and cereal bars. Instant oats are more processed, are finer in texture and are mushier when cooked.

In summary: 

🦴 You can use just rolled oats but the texture is chewy, without much crunch

🍂 You can use just jumbo oats but they will be very crunchy, a little dry, and to be honest? Not my favourite

🌟 HALF AND HALF (rolled and jumbo) are honestly the BEST combo – both crunchy and chewy – yum!

🚫 Instant oats (like Ready Brek) are a no-no for flapjack

IMAGE: See the photo below showing the different between using just rolled oats (the bottom flapjack) and using this recipe with half rolled and half jumbo (the top flapjack)…

Two slabs of baked flapjack, showing the difference between using just rolled oats and using half rolled and half jumbo oats.

How we came up with this recipe for Flapjacks

A traditional Flapjack recipe originated in Great Britain and is made from butter, golden syrup, sugar, oats (my recipe has a touch of salt too and a chocolate topping to give it an edge). 

Other recipes that involved using only one kind of oat, as mentioned above, just didn’t work for me. I know how I like my flapjack texture and overly one way or the other isn’t it! 

Which is why the half and half method works so well. 

Of course, there are a number of variations of flapjack recipes, such as peanut butter flapjacks, honey flapjacks, fruity flapjacks and banana flapjacks. But for me, nothing can top Golden Syrup flapjacks.

To make the best homemade flapjacks, simply melt and mix your ingredients together and bake in a square tin until golden brown, then slice them into squares once everything is cool. The melted chocolate is optional, but I’d highly recommend drizzling it over the flapjacks at the end. 

This recipe will forever remind me of coming home from school and raiding the cake tin expectantly (and there is no hunger like that 3:30pm after-school hunger, is there?) Now it’s time for you to make your own memories. Hope you love it! 

Some other favourite traybakes 

Flapjack Recipe Ingredients

The raw ingredients for a flapjack recipe laid out on a counter, including a bottle of Golden Syrup, and bowls filled with oats, butter, sugar, salt and choc chips.
  • Butter – Unsalted or salted is fine. If you use salted, reduce the salt in the recipe to ½ tsp
  • Golden Syrup
  • Sugar – Soft light brown sugar
  • Oats – I use a mixture of jumbo whole oats and rolled oats for a good consistency of both light/crumbly and dense at the same time
  • Salt – You can leave this out for small children but it does bring out the flavour and add something
  • Milk chocolate – Melted to drizzle (any kind). I use this kind for baking.

How to make Flapjacks

Brown sugar, butter and golden syrup in a pan for step 1 in the recipe for Flapjacks.

1. Preheat your oven, line your baking tray and then add your butter, sugar and golden syrup in a large pan.

A pan with melting butter and sugar for step 2 in the recipe for flapjacks.

2. Heat gently, then once the sugar has dissolved, remove from the heat and stir in the oats and salt.

Oat mixture pressed into a baking tray for step 3 in the recipe for flapjacks.

3. Put your mixture into your baking tin and pat down flat with a spoon. Bake for 20 minutes until golden brown.

Squares of oaty flapjacks after baking.

4. Leave to cool well before slicing and drizzling over the melted chocolate.


  • Golden syrup – This gives the lovely sticky texture. You can replace it with honey if you prefer but it can be more unpredictable as honey is a natural product where the consistency varies. The flavour can also be quite strong.
  • Brown sugar – Soft light brown sugar gives a good flavour but caster sugar will work too.

Storing Flapjacks

In my experience they don’t last long enough to be stored, but if your family is resisting too much temptation, you can store the flapjacks in an airtight container for about 7 days.

In the freezer You can also freeze them in portions for up to a month.

Top tip for making homemade Flapjacks

Which oats to use 

As outlined above, I use a mixture of jumbo whole oats and rolled oats in this flapjack recipe. 

I find that jumbo oats give a lighter, more crumbly texture. Rolled oats make a more dense texture. Both together work really well (I also use this technique in my Granola Bars).

That said, if you only have one type, you can still follow this recipe. The resulting texture might just be a little different than I’ve explained (it will still be delicious). Just keep an eye on them in the oven as timings may vary slightly.


Why are my flapjacks still gooey?

You need to leave them to cool! Make sure they’re completely cooled before cutting them into 16 squares. This will help them to keep their shape and means that you don’t need to overcook them.

Is this the same as flapjack in the US?

No, they’re very different things! In America, a flapjack is a kind of thick pancake, whereas in the UK it’s a gooey, chewy, granola-style oat bar. Any USA readers – please tell all about your flapjacks!

Should flapjack be crunchy or chewy?

For me the perfect flapjack is a chewy one, with slightly crunchy edges. If you’re a fan of more crunchy flapjack, just cook for slightly longer than the recipe says.

Can I make these vegan flapjacks?

Sure. Just replace the butter with a dairy-free spread, and make sure you use vegan chocolate or omit it altogether.

Why have my flapjack gone hard?

This is almost always down to overbaking. In future, just turn your oven down by a fraction and cook them for 5 minutes less.

Why has my flapjack fallen apart?

This is usually down to cutting them before they are completely cold. If you want neat slices, let them go totally cold before cutting. It can also be when they are slightly underbaked.

Let me know how you got on and what you thought of these recipes. Please rate the recipe using the ⭐️ below.

Also I’d LOVE to see your cooking creations. If you’d like to share yours with me, you can tag me on Instagram (@tamingtwins).

4.69 from 133 votes

Easy Flapjacks {Foolproof Recipe!}

Learn the secret of how to make Flapjacks with this easy FOOLPROOF recipe! Mix your ingredients together and bake in 20 minutes for a batch of this delicious, sticky, chewy, classic British teatime treat.
Prep Time: 5 minutes
Cook Time: 25 minutes
Total Time: 30 minutes
Servings: 16


  • 225 g Butter, See notes
  • 150 g Golden Syrup, See notes
  • 150 g Soft light brown sugar, See notes
  • 450 g Oats, See notes
  • 1 tsp Salt, See notes

For the topping:


  • Preheat your oven to 170C (340F).
  • Line a 20×20 cm baking tray with baking parchment.
  • Melt your butter, sugar and golden syrup in a large pan over a low heat. Once the sugar has dissolved, remove from the heat and stir in the oats and salt. 
  • Give the entire mixture a really good stir so that all of the oats are coated. 
  • Pour the mixture into your lined baking tin and pat down with the back of a spoon.
  • Bake in the oven for 20 minutes. (The edges should be starting to brown but the middle should still be soft and wobbly.)  
  • When the flapjack is cold, remove it from the tin and slice your flapjacks into 16 squares with a sharp knife.
  • Drizzle over the melted chocolate and allow to set.


Butter: Unsalted or salted is fine, if you use salted, reduce the additional salt in the recipe to 1/2 tsp
Golden Syrup: This gives the lovely sticky texture. You can replace with honey if you prefer but it can be more unpredictable as honey is a natural product where the consistency varies. The flavour can also be quite strong
Sugar: Soft light brown sugar gives a good flavour but caster sugar will work too
Oats: I used a mixture of jumbo whole oats and rolled oats, in this flapjack recipe. You can just use one type though
Salt: I have used 1tsp of salt. You can leave this out if you are cooking for young children, but I do have to say I think it really adds to the recipe and brings out the flavour


Calories: 278kcalCarbohydrates: 36gProtein: 4gFat: 13gSaturated Fat: 8gPolyunsaturated Fat: 1gMonounsaturated Fat: 4gTrans Fat: 0.5gCholesterol: 31mgSodium: 244mgPotassium: 128mgFiber: 3gSugar: 17gVitamin A: 366IUCalcium: 33mgIron: 1mg

Nutrition information is automatically calculated, so should only be used as an approximation.

Additional Info

Course: Snack
Cuisine: Family Food
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Sarah Rossi founder of and author of 'What's for Dinner?' books.


Hi, I'm Sarah. I help busy people decide 'What's for Dinner?' Find hundreds of recipes here, and also in my bestselling recipe book. Hope my recipes make your life easier ❤️

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  1. Lovely quick easy recipe.
    My husband and Grandson love this recipe a I am surprised because my husband hasn’t got a sweet tooth. I find it a bit sweet for me even though I have a very sweet tooth.

  2. 4 stars
    Lovely but only had organic rolled oats and added a handful of roughly chopped roasted hazelnuts and put half the mix into the tin and then added a layer of frozen black currants and then sprinkled over the topping and gently firmed. Even without the extras had far too much mix for a 20 x 20 tin so popped it into a larger rectangular tin which then took 45 mins to bake and even then was a very soft flapjack. But – everyone thought they were delicious and they disappeared in a flash.