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    Home » All Posts » Family » Lunchbox Recipes » Sweet Thermomix Lunchbox Recipes » Thermomix Lemon Crumble Slice

    Published: Feb 23, 2015 · Modified: Sep 23, 2023 by Lucy ·

    Thermomix Lemon Crumble Slice

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    I absolutely love this recipe for Lemon Crumble Slice. It's by far one of my favourites (and that's really saying something, given my addiction to all things involving sugar). I love this slice because not only does it have the yummiest oaty layers, but it seriously has the most amazingly creamy and delicious lemon filling. Creamy + lemony + oaty = all kinds of awesome.

    Thermobliss Lemon Crumble Slice

    The Thermomix really does make this lovely little recipe so simple. There's really not much to it. Once you've made the oat layers, you whip up a simple lemon filling. No mess, no hassle. Gosh it's recipes like this that really make me love my Thermomix. A LOT!!

    Lemon Crumble Bars 1

    So what are you waiting for? If you're a fan of lemon flavoured desserts and slices, then you really, really must make this. You'll love it - I pinky promise!!!

    Lemon Crumble Bars 5

    Squares of lemon crumble slice with a creamy lemon layer over the base and crunchy crumble on top.

    Thermomix Lemon Crumble Slice

    Our most popular Thermomix Lemon Crumble Slice is simply the best! Creamy lemon filling sandwiched between crunchy oat crumble!
    4.72 from 7 votes
    Print Pin Rate
    Course: Dessert
    Cuisine: Western
    Prep Time: 10 minutes minutes
    Cook Time: 40 minutes minutes
    Total Time: 50 minutes minutes
    Servings: 16 serves
    Calories: 195kcal
    Author: Lucy & Lauren
    Cost: $5

    Equipment

    • Thermomix

    Ingredients

    • 1¼ cups (155g) plain flour
    • 1¼ cups (110g) rolled oats
    • ½ teaspoon salt
    • ½ teaspoon bi-carb soda
    • ½ cup (100g) raw sugar
    • ½ cup (80g) packed brown sugar
    • ¾ cup (170g) unsalted butter, melted
    • 1 teaspoon vanilla extract
    • 1 X 395g can sweetened condensed milk
    • 1 tablespoon finely grated lemon zest (approximately 1 lemon)
    • ⅓ cup fresh lemon juice
    • 2 large egg yolks
    • ½ teaspoon lemon extract
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    Instructions

    • Thermomix Instructions:
    • Preheat oven to 170 degrees celsius (160 degrees if fan forced)
    • Grease and line a 17X28cm slice tray with baking paper, allowing the edges to overhang.
    • Melt the butter and vanilla in the TM bowl for 40 seconds, Speed 2, 50 degrees.
    • Scrape down the sides of the bowl.
    • Melt for a further 1 minute, Speed 2, 50 degrees.
    • Add the plain flour, rolled oats, salt, bi-carb soda, brown sugar and raw sugar.
    • Mix for 20 seconds on Reverse, Speed 2.
    • Scrape down the sides.
    • Mix for a further 20 seconds on Reverse, Speed 2.
    • Spread half of the crumb mixture into the bottom of the prepared tray and press firmly into an even layer.
    • Bake in preheated oven for 15 minutes or until lightly golden.
    • Remove from oven and put aside (leave the oven turned on).
    • Place the zest of 1 lemon into the TM bowl.
    • Grate for 20 seconds on Speed 6.
    • Scrape the sides of the bowl.
    • Repeat steps 13-14 until you have a very finely grated zest.
    • Add the condensed milk, lemon juice, egg yolks and lemon extract and mix for 30 seconds, Speed 4.
    • Scrape the sides of the bowl and mix for a further 30 seconds, Speed 4.
    • Pour mixture over crumb crust in baking dish and spread into an even layer.
    • Sprinkle the remaining crumble mixture over the top of the lemon layer.
    • Bake in oven for 23 – 26 minutes or until lightly golden.
    • Remove from oven and allow to cool.
    • Cover and refrigerate for at least 2 hours (preferably overnight) then take it out and cut into squares.
    • Store in airtight container in refrigerator.

    Nutrition

    Calories: 195kcal | Carbohydrates: 25g | Protein: 2g | Fat: 10g | Saturated Fat: 6g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 3g | Trans Fat: 0.3g | Cholesterol: 47mg | Sodium: 179mg | Potassium: 54mg | Fiber: 1g | Sugar: 13g | Vitamin A: 299IU | Vitamin C: 2mg | Calcium: 17mg | Iron: 1mg
    Tried this Recipe? Share it Today!Mention @Thermobliss or tag #Thermobliss!

     

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    Reader Interactions

    Comments

    1. Anthony says

      January 09, 2023 at 9:06 pm

      5 stars
      I entered this into a bake off and it won!

      Reply
      • Lucy says

        January 11, 2023 at 6:45 am

        Fantastic!

        Reply
    2. Trudy says

      October 20, 2022 at 8:30 pm

      Can this be served warm?

      Reply
      • Lucy says

        October 21, 2022 at 7:02 am

        Absolutely!

        Reply
    3. Sarah says

      December 01, 2020 at 3:19 pm

      5 stars
      Have made this soooo many times, it’s my go to slice. I add a touch more lemon and less sugar to suit my taste and leave out the lemon extract. Love how all ingredients are such staple pantry items for me and I get to use my fresh lemons.

      Reply
      • Lucy says

        December 02, 2020 at 5:01 am

        Fantastic!!!!

        Reply
    4. Anita says

      November 22, 2020 at 11:56 pm

      5 stars
      I made this for a family party and got SOO many compliments. It really was delicious! I didn’t have lemon extract though, just added an extra splash of lemon juice. Highly recommend this slice!

      Reply
      • Lucy says

        November 23, 2020 at 10:00 am

        Fantastic!!

        Reply
    5. Jess says

      October 04, 2020 at 9:18 am

      Looks lovely, any idea who long in the fridge? I like to use these sorts of Slices for lunch boxes.

      Reply
      • Lucy says

        October 05, 2020 at 7:33 am

        Hi Jess, it will be fine for up to 5 days in the fridge.

        Reply
    6. Sally says

      February 04, 2019 at 8:07 pm

      How can I make the slice gluten free?

      Reply
    7. Sandy says

      October 24, 2018 at 8:44 pm

      Can you please tell me if this slice is suitable to freeze?

      Reply
      • Lucy Mathieson says

        October 25, 2018 at 5:20 am

        I personally dont like to freeze this slice as I have found that the filling can go a bit runny when defrosted. That being said, I know other people who are happy freezing it!! xx

        Reply
    8. Shelley Elliott says

      August 03, 2018 at 4:59 pm

      This recipe is delicious. Thank you.

      Reply
    9. Tammy Scott says

      May 10, 2017 at 8:29 pm

      Can the oats for substituted for something else to make this Gluten Free?

      Reply
      • Lucy Mathieson says

        May 11, 2017 at 5:37 am

        Hi Tammy, I'm not sure as this is the only way I've made it. You could try experimenting though!!

        Reply
    10. kandis says

      October 11, 2016 at 11:35 am

      I have made this 4 times. so good. i don't have lemon extract so skip it. still tastes great

      Reply
      • Lauren says

        October 11, 2016 at 12:36 pm

        That's excellent!

        Reply
    11. Kayann says

      December 21, 2015 at 12:12 pm

      ok so I'm confused, at number 11 you say to spread half of the crumb mixture into the tray, are we then supposed to side aside the other half? or do we leave it in there & zest the lemon on top of it? The instructions aren't clear.

      Reply
      • Lucy says

        December 21, 2015 at 3:54 pm

        Yes you set the second half of the crumble mixture aside (as that is what you crumble over the top). The lemon zest forms part of the middle (the creamy portion).

        Reply
    12. Lucy says

      July 25, 2015 at 3:54 pm

      I'm keen to try this. Has anyone tried with out the lemon extract?

      Reply
    13. Tessa - Down that Little Lane says

      March 01, 2015 at 1:01 pm

      wowsers, just added the ingredients to my list to get this afternoon 🙂

      Reply

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    Hi, We're Lauren and Lucy! We're two mums who love to cook and want to show you how easy it is to make delicious family meals, baking treats and lunch box snacks in your Thermomix..

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