Key Lime Pie Bars

For a bright, tangy dessert that feels like sunshine in every bite, these key lime pie bars are a classic and are so easy to make, too!

These key lime pie bars are layered with a sweet, buttery graham cracker crust and a rich, creamy citrus filling that packs a punch of flavor. The balance of tart key lime juice with the velvety texture of condensed milk and cream cheese creates a refreshing, light and indulgent dessert.

Since the squares cut beautifully and travel well, you can make these ahead and bring them along to a backyard BBQ, potluck, picnic or bridal shower. And you don’t have to share —  they’re just right for a sweet bite after dinner at home with your family.

What to serve with key lime pie bars

These light and zesty bars make the perfect finish to a summer meal, especially one cooked on the grill or served al fresco. For a tropical twist, consider serving them after a meal of grilled Hawaiian chicken kabobs. The sweet pineapple and savory marinade offer a nice contrast to the citrusy finish of the bars.

For a more substantial meal with coastal flair, think coconut shrimp or grilled mahi-mahi. These dishes echo the island-inspired vibe of the key lime bars and round out a summery, sunshine-filled menu.

For a fresh and simple side to these meals, go with a fruit salad that complements the tartness of the dessert while adding color to your spread, like this summer fruit salad with mint and honey.

Citrusy desserts are a great finish for Mexican meals, too. Keep it simple with my easy white chicken enchiladas or easy chicken fajitas with sides of easy homemade refried beans and cilantro lime rice.

For drinks, iced mint tea or simple sparkling water are both refreshing and tie in with the lime flavor of the bars without overpowering them.

Kitchen Equipment Needed

1. 9 x 9 square baking pan
2. Aluminum foil
3. Stand mixer or hand mixer
4. Large mixing bowl
5. Food Processor

Tip: If you do not have a food processor, a rolling pin works great to crush the crackers into fine crumbs. Place the crackers in a large, sealed bag and roll the pin over it to get the desired consistency.

Ingredients needed to make key lime pie bars

Below are the items to gather to make these delicious treats.

For the Crust:

• Graham Crackers: These classic crackers make a delicious base for the bars. They’re slightly sweet with the right texture to hold up under the creamy filling. You can substitute cinnamon graham crackers if you want an extra layer of flavor.
• Brown Sugar: Adds a subtle molasses flavor that complements the tartness of the lime.
• Unsalted Butter: Binds the crust together and provides that rich, buttery taste.

For the Filling:

• Cream Cheese: Gives the filling body and a slight tang that blends perfectly with the lime juice.
• Sweetened Condensed Milk: Adds sweetness and makes the filling extra creamy and luxurious.
• Egg Yolks: Rich and silky, egg yolks help the filling set up.
• Lime Zest: Adds aromatic oils and a punch of citrus flavor. You can use zest from key limes or regular limes.
• Fresh Lime Juice: If you can find key limes, they’ll add a more sharp, floral flavor than regular lime juice.

Optional Toppings:

• Whipped Cream: A dollop on each bar adds a soft, sweet contrast to the tart lime flavor.
• Extra Lime Zest or Lime Wedges: These make a beautiful garnish and hint at the flavor inside.

Frequently asked questions about key lime bars

Below are common questions and answers about this recipe. If you have a question I haven’t covered, leave it in the comments, and I will reply as soon as I can.

Can I use bottled key lime juice instead of fresh?

Yes, you can use bottled juice if you’re in a pinch or can’t find key limes. Look for one labeled “100% key lime juice” with no added sugar for the best results.

Can I use regular limes instead of key limes?

Yes. While key limes have a unique tartness, regular limes (Persian limes) will work just fine. The flavor will still be delicious with just a little less sharp and floral.

Can I substitute for cream cheese?

Cream cheese helps balance the sweetness and gives the filling a thicker, richer consistency. While you could omit it and make a more traditional key lime filling with just condensed milk and egg yolks, the bars will be softer.

How do I store leftover bars?

Place the bars in a single layer in an airtight container and refrigerate. They’ll keep well for four to five days. If stacking them to store them, place parchment paper between layers to prevent sticking.

Can I freeze these bars?

Yes. Wrap them tightly in plastic wrap, then foil, and store in the freezer for up to two months. Let them thaw in the fridge before serving.

What’s the best way to cut clean squares?

Let the bars chill completely for at least two to four hours before cutting. Use a sharp knife and wipe it clean between cuts for neat, bakery-style slices.

Should key lime bars be brown?

You don’t want them to brown, so keep an eye on them. Bake just until the center is set, which usually takes 15–20 minutes at 350°F. The top should remain light in color.

Can I make this recipe in a larger pan?

Yes. You can double the recipe and bake it in a 9 x 13-inch dish. Just keep an eye on your baking time because they may need a few extra minutes.

What can I substitute for graham crackers?

Vanilla wafer cookies, digestive biscuits or even shortbread cookies can be pulsed into crumbs and used as a base. Some substitutions may require slightly more or less butter.

How many bars does this recipe make?

It depends on how big you slice them, but generally, you’ll get about 12–16 squares from a 9 x 9 pan. Cut them smaller if you’re serving a crowd.

Do these bars need to be refrigerated?

Yes. Because of the dairy and egg content, they need to be stored in the fridge until ready to serve. They’re best when served chilled!

Can I add more flavor to the crust?

A pinch of cinnamon or even a splash of vanilla in the crust can add a cozy warmth that contrasts beautifully with the tart filling.

How do I make gluten-free key lime pie bars?

Use gluten-free graham crackers and check that your other ingredients (like sweetened condensed milk) are certified gluten-free.

More Grandma-approved recipes to try

If you enjoyed this recipe for key lime pie bars, I bet you’ll love these other yummy treats.

• Hello Dolly Bars
• Old-Fashioned Chess Pie Recipe
• Fresh Strawberry Pie
• No-Bake Peanut Butter Pie
• Homemade Pecan Pie

Let me know if you make these delicious key lime treats! I’d love to hear what you served them with and how you liked them.