Gluten Free Key Lime Pie Bars are a variation of the traditional scrumptious Key Lime Pie. These bars have a fantastic tangy, thick filling with a homemade buttery shortbread crust topped with some homemade whipped cream and key lime zest that really pulls all the flavors together.

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Gluten Free Key Lime Pie Bars

Name: Gluten Free Key Lime Pie Bars
Prep time: 20 min
Cook time: 35 min
Total time: 175 min
Ingredients: 1 cup gluten free flour (with xanthan gum); 1/3 cup powdered sugar; ½ cup butter (softened); 4 large eggs; 1 14 oz can sweetened condensed milk; 2/3 cup key lime juice; Lime Zest (optional); Whipped cream (optional)

This fantastic Gluten Free Key Lime Pie Bars recipe is like getting to enjoy a homemade Key Lime Pie without having to put in all the time and effort to make that whole pie.

You don’t have to use a graham cracker crust like many traditional Key Lime Pie recipes, this pie bar recipe uses a buttery shortbread-like crust that is just as amazing, if not more amazing in this gluten free recipe.

I love making pie and cake bar recipes that make you feel like you’re getting all the flavor of those entire pies without having to make an entire pie or cake. Some of my favorite pie bars are Apple Pie Bars, Blueberry Crumb Bars, and Pumpkin Cheesecake Bars.

overhead shot of sliced gluten free key lime pie bars topped with a dollop of whipped cream

What You Need To Know About This Gluten Free Key Lime Pie Bars Recipe

Instead of making a full 8 or 9″ pie, you can make these Key Lime Pie Bars and enjoy smaller serving sizes that are easier to share with friends and family.

These kinds of desserts are easier to whip up to take to get-togethers, parties, holidays, and special occasions, as they’re already cut up for easy serving.

Key Lime Pie Bars are always a hit when you have to take a potluck dessert recipe to work or parties, everyone loves them whether they need a gluten free dessert or not!

gluten free key lime pie bars sliced and topped with whipped cream ready to serve

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Ingredients for Key Lime Pie Bars

Gluten Free Flour- I like to use King Arthur Gluten-Free Measure for Measure Flour, Cup4Cup, or Bob’s Red Mill 1:1 Gluten Free Baking Flour with this baking recipe, but any gluten free flour with xanthan gum will do.
Powdered Sugar
Butter- Using softened butter makes it easier to create the crust without making a lumpy crust.
Eggs
Sweetened Condensed Milk – not evaporated milk. I prefer Eagle brand. See below for dairy free suggestions.
Key Lime Juice – Fresh squeezed Key Lime Juice is the best, but you can use the bottled kind if in a pinch.
Lime Zest – While this is optional, I highly recommend it. It really ties the flavors together.
Whipped Cream– Again, this is an optional ingredient but I feel that this makes the dessert even more decadent.

overhead shot of gluten free key lime pie bar ingredients

Dairy Free Key Lime Pie Bars

To make these bars dairy free, use vegan butter in place of the regular butter. My favorite is Miyokos European Style Cultured Vegan Butter.

Replace the sweetened condensed milk with Sweetened Condensed Coconut Milk.

Equipment Needed to Make Gluten Free Key Lime Pie Bars

8×8 Inch Square Baking Pan
Parchment paper
Non-stick spray – I prefer Avocado Oil Spray
Basic baking tools: mixing bowls, whisk or hand mixer, measuring cups, and spoons.
Microplane Zester/Grater

overheard shot of a gluten free key lime pie bar on a small white plate with a gold fork

How to Make Key Lime Pie Bars Gluten Free

Step 1. Preheat oven to 350º F and line an 8×8 baking pan with parchment paper and spray with non-stick spray.

Step 2. Combine the crust ingredients and mix until combined. Press the dough into the bottom of the prepared baking pan, spreading it evenly across the bottom. Bake for 10 minutes.

Step 3. While the crust is baking, use a whisk or hand mixer to beat the filling ingredients together in a medium bowl.

Step 4. Pour the filling over the warm crust. Return to oven and bake for an additional 15-20 minutes or until filling is just set.

Step 5. Remove from oven and cool to room temperature on a wire rack then refrigerate and chill for at least 2 hours.

Step 6. To serve, garnish with freshly grated lime zest and cut bars into 16 pieces. Top key lime pie bars with homemade whipped cream, if desired.

Step 7. Store Key Lime Pie Bars in the refrigerator for up to 5 days.

Scroll down for the full printable recipe.

collage image of the process of making gluten free key lime pie bars

Tips for Making Gluten Free Key Lime Pie Bars

A homemade graham cracker crust can be made instead of the shortbread crust.
Don’t shorten the chill time, in order for these pie bars to set properly, they need a good amount of time in the refrigerator chilling.
Use a long, sharp knife when you go to cut the Key Lime Pie Bars. I recommend running the knife under hot water (and wiping off excess water) before slicing the bars. After each slice, wipe the knife clean to help keep each pie bar piece looking nice and clean.
Key lime pie bar filling is naturally gluten free, so you really only have to focus on making a gluten free pie crust.
If letting these sit out on the table when serving, don’t let them sit out longer than 2 hours. They need to be refrigerated otherwise.
If needed, you can use regular Persian limes in place of Key Limes as they can sometimes be difficult to find.
You can make these Gluten Free Key Lime Pie Bars up to 2 days in advanced, just wait to garnish your bars until you’re ready to serve and enjoy them.

a gluten free key lime pie bar on a small round white plate with a bite-sized piece on a gold fork

Other Gluten Free Dessert Recipes To Try

overhead shot of a gluten free key lime pie bar on a small round white plate with a bite-sized piece on a gold fork

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Gluten Free Key Lime Pie Bars

4.60 from 10 ratings

Prep Time: 20

Cook Time: 35

Additional Time: 2

Total Time: 2 55

Servings: 16

By: Sharon Lachendro

Print Rate Pin

Ingredients

For the Crust

1 cup gluten free flour with xanthan gum
1/3 cup powdered sugar
½ cup butter softened

For the Filling

4 large eggs
1 14 oz can sweetened condensed milk
2/3 cup key lime juice

To Serve

Lime Zest optional
Whipped cream optional

Instructions

Preheat oven to 350º F and line an 8x8 baking pan with parchment paper and spray with non-stick spray.
Combine the crust ingredients and mix until combined. Press the dough into the bottom of the prepared baking pan, spreading it evenly across the bottom. Bake for 10 minutes.
While the crust is baking, use a whisk or hand mixer to beat the filling ingredients together in a medium bowl.
Pour the filling over the warm crust. Return to oven and bake for an additional 15-20 minutes or until filling is just set.
Remove from oven and cool to room temperature on a wire rack then refrigerate and chill for at least 2 hours.
To serve, garnish with freshly grated lime zest and cut bars into 16 pieces. Top key lime pie bars with homemade whipped cream, if desired.
Store Key Lime Pie Bars in the refrigerator for up to 5 days.