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    Home » Recipes » Desserts

    Chewy Keto Lemon Bars

    Published: Apr 20, 2022

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    These Keto Chewy Lemon bars are super easy to make, low carb, and sugar-free! Think "brownie", but bright and lemony instead of chocolate!

    A plate of keto chewy lemon bars, each topped with white sugar free frosting.

    Before going low carb, I LOVED my gluten-free lemon bar recipe. I’m a huge lover of lemon desserts, and the bright flavors of citrus fruits have always been my favourite options when it comes to having a sweet treat.

    Anyway, I’d developed it for Beyond Flour, and it was wildly popular with my recipe testers (None of whom were gluten-free, themselves!), and - eventually - readers.

    My keto dessert recipes have been pretty key to sticking to the keto diet, so I did up a low carb recipe for a lemon bar, based on that easy recipe.

    While many low carb lemon bars out there have a shortbread crust topped with either a cake, Cheesecake, or gooey lemon filling / lemon curd layer - usually topped with powdered sugar - I went in a different direction with my keto lemon bars recipe.

    Think “Brownie”, but... not.

    These easy keto lemon bars have all of the texture - that gooey, chewy goodness you’d expect from a brownie - but instead of chocolate, it was a brightly flavoured citrus bar.

    Finally, rather than a sprinkling of powdered sugar, I whipped up a quick, lemony frosting/glaze for it.

    You know, really leaning in on the “lemon brownie” idea!

    Recently, I started craving those tangy lemon bars ... so it was about time I posted my sugar-free lemon bars recipe!

    How Many Carbs are in Keto Lemon Bars?

    These keto treats are a great option for anyone with a keto lifestyle.

    When it comes to carb count, these bars each have 30 grams of total carbohydrate, with 27 of those coming from the erythritol - so about 3 grams of net carbs per bar!

    A plate of keto chewy lemon bars, each topped with white sugar free frosting.

    Keto Lemon Bar Ingredients

    While some of the ingredients are pretty universal, simple ingredients available in most grocery stores - large eggs, butter, fresh lemons (for both fresh lemon juice and lemon zest), etc - there are a few that are more specific to keto baking.

    Here’s a bit of information on those ones:

    Almond Flour

    Almond flour is foundational to SO many keto and low-carb baking recipes. I buy it in bulk, as I use it so often.

    In general, you’ll have the best results from a fine grind flour that’s made from blanched almonds. That is to say, you shouldn’t see little bits of brown in the flour.

    ... That’s almond meal, but sometimes sold as almond flour.

    Coconut Flour

    Coconut flour is another super foundational ingredient when it comes to keto baking, and I often use it in conjunction with almond flour.

    While almond flour doesn’t soak up / retain much in the way of liquid, coconut flour does. This contributes to the moisture content and overall texture of your baked goods - it’s a good complement for the almond flour properties.

    Generally, you’ll use a LOT less coconut flour than you will almond flour, as a little goes a long way!

    Sugar Substitute

    There are two keto sweeteners I use for this, depending on what I have on hand any given day.

    First off is Swerve Granular Sweetener, which is straight erythritol. This is what I started with, and it’s a good standby low carb sweetener.

    More recently, I’ve been into using a Monkfruit/Erthyritol blend (I’ve used several different brands of monk fruit sweetener), which I’m slightly preferring to the Swerve.

    They both taste a lot like regular sugar, but the blend has a bit less of the “cooling” sensation in the mouth.

    A plate of low carb chewy lemon bars, each topped with white sugar free frosting.

    Confectioners Swerve

    When it comes to the frosting, I use the Swerve Confectioners Sweetener variety - it’s powdered erythritol, and is a decent analog for powdered sugar when making frosting.

    I haven’t come across any other powdered sugar offerings in my area!

    That said, there’s a different sugar free sweetener that works better... when I order it from the USA. If you have access to Powdered Allulose, I’d recommend using it.

    It’s a bit more expensive, a bit harder to find... but it does the job WITHOUT the cooling sensation / aftertaste that powdered erythritol is known for.

    Wholesome Yum's Besti Powdered Allulose is a popular option.

    Unflavoured Protein Powder

    I keep a big canister of unflavored, unsweetened protein powder on hand at all times.

    Whey protein powder was the final piece of the puzzle when I developed my Gluten-Free Soft Pretzels recipe (Not low carb!), and I’ve carried that knowledge forward in my low carb baking.

    The brand I use will generally vary based on what’s on sale, but the basics are the same:

    It has to be unflavoured, unsweetened whey protein powder. I haven’t had any issues with any brand I’ve used so far.

    Xanthan Gum

    Xanthan gum is another ingredient I’ve brought with me from my regular gluten-free baking days.

    While I used it exclusively with baking - it helps add some of the glue/stretch properties that gluten-free florus lack - these days, I also use it for a thickener for soups, sauces, etc.

    A great thing to have on hand, when you’re living la vida low carb!

    While the initial purchase may seem expensive, it lasts forever. You rarely use more than a teaspoon for a recipe.

    A plate of keto chewy lemon bars, each topped with white sugar free frosting.

    Tools You’ll Need to Make these Low Carb Lemon Bars

    This is a very basic recipe, and most of what you’ll need are just measuring spoons, measuring cups, and something to mix it all together. No food processor - or even electric mixer - necessary!

    That said, you’ll also need:

    A Zester

    I use a little handheld zesting plane for zesting citrus, but you can use the smaller grate side of a box grater.

    I LOVE LOVE LOVE my Kitchenaid box grater, and will sing its praises to anyone who will listen.

    There are cheaper options, but after decades with those cheap options? I'm obsessed with this one. A few extra dollars can make a world of difference sometimes!

    A Juicer

    I have a few different juicers here, and generally pick which to use based on how much I’m going to be juicing:

    Cuisinart Pulp Control Juicer - I usually only use this one when I have a LOT of juicing to do.

    A Reaming-Style over-Container Juicer - This isn’t the exact one I have at the moment, but the style is very similar. These are great - allowing you to manually juice into a container. This is the kind I use for recipes like this.

    A Citrus Squeezer - This was my favoured type of juicer for small amounts of needed juice, until I started having tendon problems.

    This style was easy to use, and the least amount of effort to wash, afterward!

    *****

    Obviously, any of them will work just fine for this!

    A plate of low carb chewy lemon bars, each topped with white sugar free frosting.

    How to Make Keto Chewy Lemon Bars

    The full recipe follows in the recipe card at the end of this post, here is the pictorial overview with additional info and tips:

    First thing: preheat oven to 350F (180C). Grease an 8"x 8" square baking pan with vegetable shortening or baking spray.

    I like to line the pan with parchment paper after spraying it. The spray helps the parchment stick to the baking dish, and the parchment helps with lifting the bars out.

    In a large bowl, cream together butter and sugar substitute until pale and fluffy.

    Add eggs, lemon juice and lemon zest to the mixing bowl, continue to beat until well incorporated and smooth.

    In a separate bowl, whisk together flours, protein powder, baking powder, xanthan gum and salt. Add this dry mix to the wet ingredients, stir gently until everything is well distributed.

    Transfer batter to prepared baking pan, spreading evenly.

    An 8 part image showing the batter being mixed together, as described.

    Bake for 20-25 minutes, or until set in the middle. Do not over cook!

    Allow bars to cool completely, before making the glaze:

    Whisk together powdered sugar, lemon juice, and salt. It should be very thick. Heat in the microwave for 15-20 seconds, and whisk again - it should be thick but spreadable.

    Spread frosting in an even layer over cooled bars, allow to set up before slicing and serving.

    Leftovers can be kept at room temperature - on a plate covered with plastic wrap, or in an airtight container - for several days.

    A 5 part image showing the frosting being mixed, spread on the pan of lemon bars, and a plate of the finished bars,

    Tips for Making The Best Keto Lemon Bars

    - Be sure to start with very soft butter - but NOT melted butter.

    - When you add your eggs and lemon juice, the butter may look like it’s curdling, and may clump. This is OK! Just beat it as smooth as you can for now.

    - Once the dry ingredients are added, it can be easier to beat the lumps out of the butter. The dry ingredients give the mixer more to grab onto!

    - For best results, be sure to NOT overcook these. They firm up a bit more as they cool, so just cook them until they’re set in the middle. Overcooked bars are dry. Still tasty, but not the brownie-like texture they should be!

    - Pro tip: When mixing the frosting, you want it VERY thick. I like to mix it to a point where it’s too thick to spread, then microwave it for 10-15 seconds.

    This liquefies it - VERY temporarily - so you can spread it. It’ll set up nice and firm when it cools. Just be sure to work quickly!

    A plate of low carb chewy lemon bars, each topped with white sugar free frosting.

    More Low Carb Dessert Recipes

    Looking to indulge your sweet tooth in a way that won’t spike your blood sugar? Here are some keto recipes to try!

    Keto Chocolate Chip Cookies
    Keto Chocolate Cookies
    Sugar-Free Chocolate Chip Truffles
    Keto Cheesecake
    Fudgy Keto Brownies
    Keto Raspberry Coconut Bars
    Low Carb Bananas Foster Truffles
    Keto Biscotti
    Keto Ladyfingers
    Keto Tiramisu
    Keto Cream Cheese Mints
    Keto Chocolate Mousse
    Low Carb Holiday Desserts
    Keto Creme Brulee
    Keto Carrot Cake

    ... but wait, there's more! We have a whole Low Carb Dessert Recipe section! Check it out!

    A plate of low carb chewy lemon bars, each topped with white sugar free frosting.

    Share the Love!

    Before you chow down, be sure to take some pics of your handiwork! If you Instagram it, be sure to tag me - @LowCarbHoser - or post it to My Facebook Page - so I can cheer you on!

    Also, be sure to subscribe to my free email newsletter, so you never miss out on any of my nonsense. Well, the published nonsense, anyway!

    ... and hey, if you love the recipe, please consider leaving a star rating and comment!

    A plate of keto chewy lemon bars, each topped with white sugar free frosting.

    Keto Lemon Bars Recipe

    A plate of low carb chewy lemon bars, each topped with white sugar free frosting.
    Print Recipe Pin Recipe Save Recipe Saved!
    4.67 from 3 votes

    Keto Lemon Bars

    These Keto Chewy Lemon bars are super easy to make, low carb, and sugar-free! Think "brownie", but bright and lemony instead of chocolate!
    Prep Time10 minutes mins
    Cook Time20 minutes mins
    Total Time30 minutes mins
    Course: Dessert
    Cuisine: Canadian
    Diet: Diabetic, Gluten Free
    Servings: 12 Bars
    Calories: 155kcal

    Equipment

    8 inch square glass dish

    Ingredients

    • 6 tablespoon Butter room temperature
    • ¾ cup Sugar substitute
    • 3 Large eggs
    • Juice of one lemon
    • Zest from two lemons
    • ½ cup Almond flour
    • ¼ cup Unflavoured protein powder
    • ¼ cup Coconut flour
    • ½ teaspoon Baking powder
    • ½ teaspoon Xanthan gum
    • ½ teaspoon Salt
    • Glaze:
    • 1 ½ cup Swerve powdered sugar
    • 2 tablespoon Lemon juice or more as needed.
    • pinch Salt

    Instructions

    • Preheat oven to 350F (180C). Grease an 8"x 8" square cake pan with vegetable shortening or baking spray.
    • Cream together butter and sugar substitute until pale and fluffy.
    • Add eggs, lemon juice and lemon zest, continue to beat until well incorporated and smooth.
    • In a separate bowl, whisk together flours, protein powder, baking powder, xanthan gum and salt. Add this dry mix to the wet ingredients, stir gently until everything is well distributed.
    • Transfer batter to prepared baking pan, spreading evenly.
    • Bake for 20-25 minutes, or until set in the middle. Do not over cook!
    • Allow bars to cool completely, before making the glaze:
    • Whisk together powdered sugar, lemon juice, and salt. It should be very thick. Heat in the microwave for 15-20 seconds, and whisk again - it should be thick but spreadable.
    • Spread frosting over cooled bars, allow to set up before slicing and serving.

    Notes

    27 grams of the per-serving carbs come from the erythritol - sugar alcohol - so the net carbs on each bar = 3.

    Nutrition

    Calories: 155kcal | Carbohydrates: 30g | Protein: 5g | Fat: 10g | Saturated Fat: 4g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 2g | Trans Fat: 1g | Cholesterol: 60mg | Sodium: 192mg | Potassium: 27mg | Fiber: 1g | Sugar: 11g | Vitamin A: 240IU | Vitamin C: 1mg | Calcium: 35mg | Iron: 1mg

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