Lemon Drizzle Flapjacks

These lemon drizzle flapjacks are absolutely delicious and an easy traybake to make. Adding fresh lemon zest is a lovely way to boost the flavour of the flapjacks with a yummy citrus twist.

lemon drizzle flapjacks sliced up

Lemon drizzle flapjacks are one of the best afternoon treats. It’s light and fresh and a healthy alternative to a chocolate bar or a bag of sweets when the 3pm sugar craving strikes. A lemon drizzle flapjack recipe is always in my cookbook.

Top Questions

How do you make flapjacks that don’t fall apart?
Can you add lemon to flapjacks?
How do you keep flapjacks soft?

close up of the lemon zest and white icing on the lemon drizzle flapjacks

Why you’ll love this lemon drizzle flapjacks recipe

Flapjacks are great as an afternoon snack. Simple and easy to whip up you can enjoy lemon drizzle flapjacks whenever you fancy them.

I love giving these easy lemon flapjacks as gifts. They can be wrapped in ribbon or tucked away in a pretty box. Everyone who receives them is happy as a clam.

It’s a classic recipe taken in a new direction. Lemon drizzle cake is a staple in my house so transforming it into lemon drizzle flapjacks was a no-brainer.


For the full recipe and instructions scroll to the bottom of the page for the recipe card.

Condensed Milk

Sweet and perfect for making flapjacks. These lemon drizzle flapjacks with condensed milk are chewy and full of flavour.


Very few bakes can be made without butter. You need butter to combine all your ingredients together. I use unsalted butter but you can lightly salted if you want.

Golden Syrup

I love golden syrup, it’s thick and sweet and adds sweetness to your lemon drizzle flapjacks. It also helps your flapjacks bind together.

Light Brown Sugar

Brown sugar is just white sugar with molasses left in it. It’s richer than white sugar and adds a more caramelly taste to your lemon flapjacks. It’s well worth trying but if you don’t have it you can swap in caster sugar.


It wouldn’t be lemon drizzle flapjacks without lemon! The sharp and cirtus flavour is perfect against the sweetness of the flapjacks.

How to make lemon flapjacks – step by step

For the full recipe and instructions scroll to the bottom of the page for the recipe card.

Place the butter, caster sugar, golden syrup and condensed milk into a saucepan.

Melt the ingredients together on a medium-low heat so they soften and melt gradually. Keep stirring so they don’t burn.

Remove the saucepan from the heat and stir in the oats. Add the fresh zest of the lemon and stir in.

adding lemon zest into the oats

Pour the mix into the prepared cake tin and level off.

Put the flapjacks in the oven and bake for 20 minutes until golden brown.

When they are baked and still warm, gently slice the flapjacks. It’s a lot easier when they are still warm.

lemon drizzle flapjacks

Mix the icing sugar and water together to form royal icing and while it’s still runny, drizzle the icing over your flapjacks. Add some lemon zest too.

Top Tips

Serve your flapjacks warm with ice cream. It’s a real crowd-pleaser. You can even add some more lemon zest on top for that extra citrus punch.

Lemond drizzle flapjacks with condensed milk are perfect for using up the condensed milk you have in the cupboard. I love recipe that reduce waste so this is great for when you’re hungry and have a full cupboard.

You can gift these lemon drizzle oat bars too, they can be stacked and tied with ribbon or placed in a pretty box. Everyone I’ve sent these too have loved them and always asked for seconds!

Serving Suggestions for lemon drizzle flapjacks

I like warm flapjacks, fresh from the oven while they’re still soft. Especially when served with a big scoop of ice cream. Vanilla goes wonderfully with the lemony goodness.

You can also package these flapjacks up and take them on your picnic or in your lunchbox. They travel really well and are the perfect afternoon pick-me-up.


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lemon drizzle flapjacks with a drizzle of white icing

Substitutions and variations

Lime Flapjacks

When life doesn’t give you lemons, use limes! You can swap out the lemon zest and use the zest of a lime. The flavour is wonderful and really bright. Perfect for sunny afternoons.

Lemon and White Chocolate Flapjacks

Lemon and white chocolate go together perfectly, both sweet and sharp they balance each other. You can melt some white chocolate and then drizzle it over the flapjacks once they’ve cooled.

Storing lemon drizzle flapjacks / Making ahead of time options

Flapjacks can be eaten fresh or up to 3 days after they’ve been baked. You can store your flapjacks in an air-tight container in a dark cupboard or in the fridge.

When you store your lemon drizzle flapjacks, make sure you wait until they are fully cooled and stack them with a piece of kitchen roll in between each layer.

lemon drizzle flapjacks with a drizzle of icing and lemon zest


How do you make flapjacks that don’t fall apart?

You make flapjacks that don’t fall apart by following a recipe and ensuring you use enough condensed milk to stick all your ingredients together. This binding agent will help stop your flapjacks from falling apart.

Can you add lemon to flapjacks?

Yes, adding lemon to flapjacks is a great idea. It adds a light citrus flavour to your flapjacks and makes them taste wonderful.

How do you keep flapjacks soft?

Flapjacks go hard when they are over baked or you haven’t used enough condensed milk. When flapjacks first come out of the oven they are soft but they do harden a little when they cool.

lemon drizzle flapjacks on white baking parchment

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Air Fryer Flapjacks

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Lemon Drizzle Flapjacks

Sisley White
These lemon drizzle flapjacks are absolutely delicious and an easy traybake to make. Adding fresh lemon zest is a lovely way to boost the flavour of the flapjacks with a yummy citrus twist.
5 from 9 votes
Prep Time 20 minutes
Cook Time 20 minutes
Total Time 40 minutes
Course Bakes, Cakes
Cuisine British, English
Servings 16 large slices
Calories 406 kcal


  • 200 g (7 oz) condensed milk
  • 300 g (1 cups) unsalted butter
  • 250 g (1 cups) golden caster sugar
  • 3 tbsp (3 tbsp) golden syrup
  • 600 g (7.5 cups) oats
  • 1 lemon

Lemon Drizzle Decorations

  • 50 g icing sugar / confectioners sugar
  • 1 lemon (zest and juice)


  • Preheat the oven to 170ºC / 160ºC fan / 320ºF / Gask mark 3.
  • Line 9 x 12 inch tin with greaseproof paper. It's so much easier for getting them out.
  • Add the butter, golden syrup, caster sugar and condensed milk to a saucepan and on a low heat melt together. Keep stirring to make sure it doesn't stick or burn.
  • Keep stirring to make sure it doesn't stick or burn.
  • Remove the saucepan from the heat and stir in the oats and fresh lemon zest.
  • Spoon the mix into the tin and level off.
  • Bake in the oven for about 20 minutes until light golden brown.
  • Leave the flapjacks to cool.

Decorating the lemon drizzle flapjacks

  • Zest the lemon and set aside while you make the icing.
  • Sieve the icing sugar into a small bowl.
  • Juice the lemon and gradually add the juice to the icing sugar to make a drizzle (you might need less or more so add it gently to make the right ribbon-like consistency).
  • Drizzle the icing over the flapjacks and sprinkle the lemon zest on top. You can leave the icing to set or slice up and serve straight away.


  • If you want to add flavours, nuts or dried fruit then mix them in with the oats in the recipe.
  • As they stay soft you can make them ahead of time.
  • They are easy to freeze and defrost when you want a slice or two.


Calories: 406kcalCarbohydrates: 55gProtein: 6gFat: 19gSaturated Fat: 11gPolyunsaturated Fat: 1gMonounsaturated Fat: 5gTrans Fat: 1gCholesterol: 45mgSodium: 21mgPotassium: 206mgFiber: 4gSugar: 29gVitamin A: 505IUVitamin C: 7mgCalcium: 63mgIron: 2mg

Please note that the nutrition information provided above is approximate and meant as a guideline only.

Keyword condensed milk, condensed milk flapjacks, flapjacks, flapjacks recipe, lemon, lemon drizzle cake, oats
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9 thoughts on “Lemon Drizzle Flapjacks”

  1. 5 stars
    Oh, my goodness, these flapjacks look incredible! I love all the lemony goodness and the idea of adding zest for an even bigger lemon punch. Yum!


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