Vibrant Lime Bars

You’ve all (I assume) had lemon bars before but today we’re talking about lemon bars’ vibrant twin…LIME BARS.

That’s right, shortbread cookie flavored crust topped with an incredible, sweet-and-tart custard lime filling baked and chilled to perfection. These lime bars are the ultimate summertime treat that’s guaranteed to surprise and delight your friends and family. Yes, they can easily be made gluten-free and dairy-free, too!

These beautiful lime bars are easier to make than you think, but take a bit of time and care so be sure to read through the instructions, any substitutions, and all of my tips as you start baking. I hope you love them as much as we do!

Everything you’ll need to make these lime bars

These beauties are bursting with lime flavor thanks to plenty of fresh lime juice, and have the perfect amount of sweetness. Here’s what you’ll need to make them:

Sweetener: you’ll need granulated sugar for the lime custard filling, and a little pure maple syrup to sweeten the shortbread base.
Lime: these bars pack plenty of vibrant lime flavor from both fresh lime juice and lime zest.
Eggs: we’re using four whole eggs in the filling to help achieve the custard-like texture.
Flour: a little all-purpose flour helps set the filling, and fine blanched almond flour creates the shortbread crust.
Butter & oil: you’ll need a couple tablespoons of butter for the filling, plus a little coconut oil in the crust to help both set well with the right amount of moisture.
Food coloring: if you want to make the filling a festive green color, feel free to add a few drops of artificial dye-free green food coloring! This is, of course, optional.
Baking staples: don’t forget the vanilla extract and salt in the base!
For topping: I like to top the bars with powdered sugar and extra lime zest for a pretty look.

Can I make them gluten-free?

Yes! Simply swap the all purpose flour in the filling for 1:1 gluten-free all purpose flour.

What about vegan or dairy-free?

You can replace the butter in the filling with vegan butter to keep the lime bars dairy-free, but please note that these bars cannot be made vegan because I do not have a substitute for the eggs in the filling.

How to make the best lime bars

Mix the filling. Start by using clean fingers to rub together the lime zest and the sugar in a medium pot to infuse the sugar with lime flavor. Whisk the lime-sugar mixture in the pot with lime juice, eggs, and flour until there are no more streaks of egg, then set it aside.
Bake the crust. Mix all of the crust ingredients in a medium bowl until a thick crumb texture forms. Press it into an 8×8 inch pan lined with parchment paper, and bake until slightly golden brown on the edges.
Cook the filling. While the crust is cooking, place the pot with the filling over medium-low heat and whisk constantly until the mixture thickens. Remove it from the heat, then pour the filling through a sieve over a medium bowl and mash it through the strainer with a spoon.
Bake the bars. Stir the butter into the warm filling until melted, and add your food coloring (if using). Pour the mixture over the warm crust and spread evenly with a spatula. Bake bars until the filling is set and barely jiggly.
Cool (then cool again). Let the bars cool to room temperature for 1-2 hours, then refrigerate for at least 2 hours.
Top & serve. Dust the bars with powdered sugar and sprinkle extra lime zest if you’d like, then slice using a clean, sharp, wet knife and serve!

Don’t forget these helpful tips

Lemon and lime bars can be a little bit tricky because of how soft the filling is, but with these easy tips you’ll have perfect lime bars every time:

Use the right pan. Be sure to use an 8×8 inch pan, not 9×9, because 9×9 will be create bars that are too thin.
Whisk the eggs completely. When you whisk your eggs into the filling mixture, make sure to do so until there are no white streaks. Otherwise, you may end up with white streaks in the bars after they’re baked.
Add the filling to WARM crust. Don’t let the crust cool to room temperature before adding the filling, otherwise the filling may seep into the crust and pieces of the crust may float into the filling layer.
Don’t overbake. Overbaking the lime bars may cause them to crack on the tops.
Cool, then refrigerate. Be sure to cool the bars completely to room temperature before refrigerating them. Otherwise, the tops may crack from the temperature change.

The key to slicing lime bars

Because the filling in lime bars is soft, you’ll want to slice them into bars using a sharp, wet knife (as I mentioned). Clean and wet the knife after each slice to ensure that the bars cut cleanly!

Recommended tools for this recipe

See more of our go-to kitchen essentials here!

How to store & freeze lime bars

To store: place leftover lime bars in an airtight container and place in the fridge for up to 4 days. If you are stacking the bars, add a sheet of parchment paper in between the layers to prevent sticking. You will likely need to add additional powdered sugar on top of the bars before serving as it may dissolve into the bars in the fridge.
To freeze: wrap the bars well and place them in a freezer-safe bag or container before putting them in the freezer and simply let them thaw in the fridge before enjoying. They should stay good in the freezer for up to 2 months.

More bars & brownies you’ll love

Get all of my bar recipes here!

I hope you love these vibrant lime bars! If you make them be sure to leave a comment and a rating so I know how you liked them. Enjoy, xo!

The
Ambitious Kitchen
Cookbook

125 Ridiculously Good For You, Sometimes Indulgent, and Absolutely Never Boring Recipes for Every Meal of the Day

Prep Time 20 minutes

Cook Time 20 minutes

Total Time 7 hours 40 minutes

Serves16 servings

Vibrant lime bars with a delicious shortbread base and a perfectly sweet and tart lime custard filling. These beautiful lime bars can easily be made gluten-free and dairy-free, and are extra special with a little powdered sugar and lime zest on top. The ultimate summer treat!

Ingredients

For the lime base:
1 cup (200g) granulated sugar
2 tablespoons lime zest
½ cup (100g) fresh squeezed lime juice (you’ll need 6 to 10 limes, depending on how big the limes are)
4 large eggs
¼ cup (30g) all-purpose flour*
2 tablespoons salted butter (or vegan butter), at room temperature
1 to 4 drops of artificial dye-free green food coloring (optional, to get a bright green color)
For the shortbread base:
1 ½ cups (168g) fine blanched almond flour
3 tablespoons melted coconut oil (or sub melted vegan butter or regular butter)
2 tablespoons pure maple syrup
1 teaspoon vanilla extract
¼ teaspoon salt
For serving:
Powdered sugar, for dusting
Additional lime zest, optional

Instructions

Preheat the oven to 350 degrees F. Line an 8×8 inch square pan (DO NOT USE 9×9 inch as it will be too big). NOTE: It’s important to use an 8×8 inch as a 9×9 inch pan may be too big.
In a medium pot, add the sugar and lime zest and use clean fingers to rub the mixture together for about 30 seconds so the lime releases into the sugar and infuses it with flavor. Next, add the lime juice, eggs, and flour and whisk together until the mixture is well combined and no streaks of egg remain. Do not add in the butter or food dye yet. Set the pot aside.
In a medium bowl, add the almond flour, coconut oil, maple syrup, vanilla extract and salt. Mix together with a fork until it forms a nice thick crumb texture. Add to the pan and use your fingers to evenly press down into the pan. Bake for 8-9 minutes until the crust is slightly golden brown on the edges. Remove from the oven and set aside to cool for 5 minutes. Keep heat in the oven.
While the crust cooks, place the pot over medium-low heat and whisk constantly until the mixture thickens and coats the back of a spoon, about 6 to 8 minutes. Once the mixture has thickened, remove from heat.
Place a sieve (fine mesh strainer) over a medium bowl. Pour mixture into the sieve and use a spoon to work and mash down the filling through the stainer.
In the bowl with the warm lime filling, stir in the butter until melted and a few drops of green food dye to achieve a vibrant green color, if desired. Immediately pour the mixture over the warm crust and tilt the pan or spread with a spatula to evenly distribute the lime filling. Place the pan back in the oven and bake for another 8 to 11 minutes until the filling is set and barely jiggly when the pan is gently shaken.
Allow bars to cool at room temperature for 1 to 2 hours, then transfer to the fridge and chill for at least 6 hours or up to 2 days.
Dust with powdered sugar and cut into 16 bars using a clean, sharp, wet knife. Clean and wet the knife after each cut. Annoying, but it helps to get the perfect cut! Add a little extra lime zest on top if you want a little extra zing.
To store: Place leftover bars in an airtight container and place in the fridge for up to 4 days. If you are stacking the bars, add a sheet of parchment paper in between the layers to prevent sticking. You will likely need to add additional powdered sugar on top of the bars before serving as it may dissolve into the bars in the fridge.

Recipe Notes

To keep bars dairy free: Use vegan butter in this recipe.
*To keep bars gluten free: Use a gluten free 1:1 all purpose flour in place of regular all purpose flour in the lime custard mixture.

Nutrition

Serving: 1lime barCalories: 173calCarbohydrates: 18.5gProtein: 3.8gFat: 10gSaturated Fat: 4.1gFiber: 1.3gSugar: 14.6g

Recipe by: Monique Volz // Ambitious Kitchen | Photography by: Eat Love Eats