Raspberry Custard Blondies

close up of raspberry custard blondies on baking paper

A fudgy vanilla blondie batter swirled with tart raspberries and creamy custard.

unbaked raspberry and custard blondies in a baking tray
cut raspberry and custard blondies on a dark background with a cup of tea

I made these tasty numbers for a collaboration with Le Creuset I’m doing on instagram at the moment. I thought it would be a shame not to share the recipe on here too so it’s easily accessible for all!

The batter comes together in a pinch, just melted and stirred together on the stove top. I use custard powder for a very quick (and nostalgic) custard which goes in the middle of the bars. If you want you can make custard from scratch or buy the pre-made stuff from the fridge section of the supermarket! The tangy raspberries really help to offset some of the sweetness from the batter and makes these casual bars feel a bit more dessert-y.

Raspberry & Custard Blondies

4.28 from 25 votes
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Course: Bars and Brownies



  • 200 ml (3/4 cup plus 1 tbsp) whole milk
  • 3 tbsp instant custard powder


  • 110 g (1/2 cup) unsalted butter
  • 220 g (1 cup) light brown sugar
  • 1 medium UK egg (large US egg)
  • Zest of 1 lemon
  • 125 g (1 cup) plain white flour
  • ¼ tsp fine table salt
  • 150 g (5.3 ounces) raspberries


  • Preheat the oven to 200°C / 180°C fan/ gas mark 4 / 350°F and line your Le Creuset 23cm (9-inch) square cake tin with baking paper.

    Make the custard:
    Combine the milk and custard powder in a medium saucepan. Heat over a medium-low heat, whilst whisking to prevent lumps, until thickened. Pour into a bowl and set aside to cool.

    Make the batter:

    Rinse out the saucepan you were using for the custard and place back onto the stove. Add the butter to the saucepan and allow to melt over a low heat. Keep cooking until the butter foams up and smells nutty, then stir to prevent the milk solids from sticking to the bottom of the saucepan. Once the foaming subsides, remove from the heat and set aside to cool.

    As you wait for the butter to cool, combine the light brown sugar, egg and lemon zest in a medium mixing bowl. Whisk together until smooth and slightly pale. Add in the cooled, melted butter and stir until combined. Add the flour and salt and stir in to make a thick batter.

    Assemble and bake:
    Pour most of the batter into the prepared tin, reserving a few tablespoons for topping later on. Spread the batter out into an even layer then pour the cooled custard over evenly. Sprinkle on the raspberries and randomly dot with spoonfuls of reserved batter on top.

    Bake for 25-35 minutes, until golden brown on top but still slightly squidgy (the custard will remain slightly gooey so a skewer test won’t work here). Allow to cool then slice into 16 squares and store in an airtight container in the fridge for up to 5 days.


Allergens: milk, wheat, gluten, eggs
Tried this recipe?Let me know how it went! Mention @izyhossack or tag #topwithcinnamon!

5 thoughts on “Raspberry Custard Blondies”

  1. I wanted to check the custard quantities- normal custard is 2tbsp per 500ml milk – yours would be almost solid! Is that right?

    • Hi Alison! Yep it is 3 tbsp but it’s the instant custard powder which is less ‘strong’. The custard is definitely thick once set though as otherwise it would just pour straight out of the blondies once baked! It’s more similar to the texture of the custard in a Portuguese custard tart, if you know what I mean 🙂

  2. These look *utterly* delicious, Izy. Lemon, berries, custard – oh my. We will have to make these soon, perhaps with brambles from the garden. And I must save up for your Le Creuset baking tin. I didn’t know they made such things.

  3. Instant custard powder is relatively hard to find over here, but this is stunning nonetheless! I love love looove seeing summery flavors in the middle of fall when my entire feed is just brimming with pumpkin spice lattes, haha. Definitely keeping this one on the books for a chilly day that requires a warm oven!

  4. These look wonderful! And I happen to have a tin of custard open. Would you happen to know the quantity of ready made custard I would need to use? I made your sourdough brownies this week and they were glorious!

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