Keto Desserts

Easy Keto Strawberry Rhubarb Custard Bars

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Some of the best rhubarb recipes start with your imagination and that’s what I did when Mrs. CBB and I created these easy Keto Strawberry rhubarb custard bars.

These are going to be the bars you will want to make the next time you have a BBQ or potluck to go to or you are hosting a dinner party.

If you are hosting a garden party or participating in one you can make these a couple of days in advance which is great news. No one likes to rush around the night before or the day of.

Everyone who eats a sugar-free, gluten-free, low-carb, keto diet knows that having sweets once in a while is somewhat desired just like everyone else.

The great part is with nuts and coconut you are able to create so many delicious low-carb recipes from cookies, loaf breads to pretzels and so on.

Nuts are the perfect substitution for flour which is a gluten nightmare.

Strawberry Rhubarb Custard Bars Keto Gluten-free Sugar-free 2With a huge patch of fresh, organic rhubarb growing in our back garden and a recent trip to the strawberry patch we had enough fruit to start baking and froze 2 large freezer bags full.

We made some sugar-free strawberry chia jam and these lovely strawberry rhubarb custard bars along with copycat Starbucks strawberry acai pink drinks.

Coming from the UK I swear custard was a part of our daily diet and something Mrs. CBB noticed.

Yes, there are lots of custard desserts in the UK which is why my parents love Boston Cream donuts from Tim Hortons when they visit Canada.

My mum and dad love custard and even when we returned to the UK last year she had at least a dozen custard cups prepared in the refrigerator at any given time.

It’s just a British thing I guess.

Strawberry Rhubarb Custard Bars Keto Gluten-free Sugar-free 5 fb

The great part about tradition is being able to blend flavours and textures to come up with new ideas which is what we did with this recipe.

You will find the base of these strawberry rhubarb bars to be similar to that of the sugar-free caramel cheesecake we make as we tend to keep things simple.

When creating the custard filling we wanted to make sure that we had enough eggs and cream to create a thick filling but added in some (we use this>>> xanthan gum to help this process along.

Instead of straight whipping cream we cut it unsweetened almond milk which offered the custard light almond notes.

If you prefer a tart custard square you can add less strawberry and more rhubarb or the other way around depending on your preference.

We went for the balanced approach as we both like each fruit equally and think the flavours pair well especially with the notes of almond extract in the crust.

For the topping we kept that simple as well with a simple whipped cream cheese topping that was fluffy and airy then added more slices of strawberry on top when served.

Serving these strawberry rhubarb custard bars cold is a must and you may find after a couple of days chilling in the refrigerator that they taste even better.

This tends to happen with just about every keto dessert we create and we believe it has something to do with letting the flavours set.

The same thing goes for cookies and puddings as well but you can eat these strawberry rhubarb custard bars as soon as they are chilled without issue.

How to make Keto Strawberry Rhubarb Custard Bars

Strawberry Rhubarb Custard Bars Keto Gluten-free Sugar-free 4

Easy Keto Strawberry Rhubarb Custard Bars
Recipe Type: Keto Dessert Bars
Cuisine: Low-Carb, Gluten-Free, Sugar-Free
Author: Mr.CBB
Prep time:
Cook time:
Total time:
Serves: 24
You will love how easy it is to make these Strawberry Rhubarb Bars!
  • Almond Flour Crust
  • 2½ cups Almond Flour (not Almond meal)
  • ¼ cup Granular Sweetener of choice
  • 1 cup cold butter cubed
  • 1 tsp Almond Extract
  • 1/2 teaspoon pink Himalayan salt
  • Custard Filling
  • 8 small eggs or 4 large eggs beaten
  • 1 cup Sukrin Gold brown sugar or granular sweetener of choice
  • 2 1/2 cups fresh sliced strawberries
  • 2 1/2 cups fresh sliced rhubarb
  • 1/2 teaspoon pink Himalayan salt
  • 1 tablespoon pure vanilla extract
  • 1 tsp xanthan gum
  • 1/2 cup unsweetened almond milk
  • 1/2 cup heavy whipping cream
  • Topping
  • 6 ounces softened cream cheese
  • 1 cup heavy whipping cream
  • 1/2 cup Swerve or other sugar substitute
  • 1 teaspoon pure vanilla extract
  1. Pre-heat Oven 350 degrees
  2. In a large bowl mix all the dry Almond Crust ingredients until combined then cut in the cold butter until the crust looks crumbly.
  3. Grease your 13×9 baking pan with a bit of butter or line the bottom with parchment paper
  4. Press the almond mixture into the base tightly and bake for 10 minutes or until just golden
  5. Remove from oven and let cool.
  6. For the filling add the eggs, xanthan gum, vanilla extract, Sukrin Gold brown sugar, heavy cream, almond milk, salt in a stand-mixer or bowl and mix to combine. Fold in the rhubarb and strawberries. Pour mixture over the cooled almond crust and bake for 35 to 45 minutes at 350 degrees until the custard sets. Remove from oven and cool completely.
  7. Add all of the topping ingredients to a stand mixer or bowl and cream together to form a fluffy topping. Spread evenly over top the custard squares. Cover and chill in the refrigerator. Cut into squares and serve.
  8. Top with extra strawberry or rhubarb slices for added appeal.
  9. Freeze for up to 2 months or refrigerate up to a week.

I hope you enjoy this perfect party dessert and the next time you have a gathering to go to whip up a batch and I bet you that no one will know they are keto let alone gluten-free and sugar-free. Try it, you’ll see.

You can freeze the strawberry rhubarb squares up to 2 months however they’ve never lasted longer than that in our house so they may keep far longer than that. If you refrigerate a week at the longest possibly 2.


Discussion: What are some of your favourite fruit custard bars?

Nutrition: 24 bars,  4 net carbs each bar, 15 grams fat.

Note: With any keto recipe the Net carbs will vary depending on what app or online system you use.

Please share this recipe with your friends if you think they might like it and please leave a review and tell me what you think. You can also pin the recipe on Pinterest and share on just about every social media outlet. Big Thanks.

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