These key lime pie bars are a bright, refreshing dessert that pairs a tangy key lime filling with a sweet, buttery cookie crust. The recipe is straightforward and uses just a few pantry staples, so even beginner bakers can make a batch quickly. Serve chilled for a cool, citrusy finish perfect for spring and summer gatherings.
Key lime pie bars are ideal when you want a light dessert. The tartness of the lime filling balances the sweet, crumbly crust, creating a delightful contrast of flavors and textures. Garnish with lime zest, thin lime slices, or a dollop of whipped cream to enhance both flavor and presentation.
Why You’ll Love This Recipe
- Bright, citrus-forward flavor from key lime juice delivers a refreshing tartness that complements the sweet filling.
- Satin-smooth filling contrasts with a crisp, chewy cookie crust for a pleasing texture combination.
- Simple and fast to prepare: the filling uses only sweetened condensed milk, key lime juice, and Greek yogurt (or sour cream).
- Chilled and refreshing—an excellent choice for warm-weather entertaining or picnics.
- Versatile: top with whipped cream, meringue, or fresh berries, or swap cookie types for seasonal variations (gingersnaps are great in winter).
- Easy to adapt for dietary needs: use coconut condensed milk and dairy-free yogurt for a dairy-free version, and gluten-free cookies for a gluten-free crust.
Ingredients
- Sweetened condensed milk
- Plain Greek yogurt (or sour cream)
- Key lime juice
- Lime zest, for topping
- Graham cracker crumbs (or crushed cookies such as gingersnaps)
- Brown sugar
- Salted butter, melted
See the recipe card below for exact measurements and full instructions.
Substitutions
If you need to swap ingredients, here are simple options to accommodate dietary preferences:
- Dairy-free: Use coconut-based sweetened condensed milk and dairy-free yogurt in the filling. Swap butter for vegan butter or coconut oil in the crust, and top with dairy-free whipped cream.
- Gluten-free: Replace graham cracker crumbs with gluten-free graham crackers or another gluten-free cookie to make the crust safe for gluten-free diets.
Variations
Try these flavor twists to change the profile of the bars:
- Coconut: Fold shredded coconut into the crust and sprinkle toasted coconut on top for a tropical touch.
- Ginger: Use crushed gingersnaps for the crust to add warm, spicy notes.
- Chocolate: Replace the crust with chocolate wafer crumbs for a chocolate-lime pairing.
- Raspberry: Add a thin layer of raspberry jam or fresh raspberries on top for a fruity contrast.
Note: If you make other changes, results may vary—adapt bake times or proportions as needed.
How To Make Key Lime Pie Bars
Step 1: Combine cookie crumbs, brown sugar, and melted butter in a bowl until the mixture resembles wet sand. Use graham crackers, gingersnaps, or other wafer cookies.
Step 2: Press the crumb mixture firmly into the bottom of an 8×8″ baking dish lined with parchment, using the bottom of a glass or measuring cup. Bake the crust until set and allow it to cool.
Step 3: Whisk together sweetened condensed milk, Greek yogurt (or sour cream), and key lime juice until smooth and fully combined.
Step 4: Pour the filling over the cooled crust and spread it evenly. Bake until the filling is just set, then remove and cool to room temperature before chilling.
Step 5: After baking, chill the bars in the refrigerator for at least 2 hours or overnight so they finish setting.
Step 6: Once fully chilled, slice the pie into bars, garnish with lime zest (and whipped cream if desired), and serve.
Baking Tips
- Press the crust firmly using the bottom of a glass or measuring cup to create an even base.
- If you don’t have an 8×8″ pan, two loaf pans can work, though thickness and bake times may vary.
- A 9×9″ pan will make the crust too thin; avoid using one unless you increase crust ingredients.
- Do not overbake the filling—overcooking can cause cracking and a dry texture.
- Cool at room temperature before refrigerating to prevent condensation that can affect texture.
- To chill faster, place the cooled dish in the freezer for 20–30 minutes before serving, then move to the fridge if needed.
Frequently Asked Questions
Common questions about making key lime pie bars:
Traditional recipes use sweetened condensed milk, which is dairy. This recipe can be made dairy-free by substituting coconut-based sweetened condensed milk and using dairy-free yogurt and toppings.
The standard crust uses graham crackers, which contain gluten. Swap in gluten-free graham crackers or another gluten-free cookie to make the bars gluten-free.
Stored in an airtight container in the refrigerator, the bars keep well for up to 5 days, best within the first 3 days. For longer storage, freeze for up to 2 months.
Yes—regular limes will work, though the flavor differs slightly. Key limes are a bit sweeter and more aromatic. If using bottled key lime juice, you’ll save time since this recipe needs a larger amount of juice.
Equipment
No special tools required—just an 8×8″ baking dish, parchment paper, mixing bowls, measuring cups and spoons, a whisk, and a spatula.
Storage
Refrigerated
Keep bars refrigerated in an airtight container or covered tightly with plastic wrap or foil. They stay best within the first 3 days but can be kept up to 5 days.
Freezing Instructions
Freeze fully cooled bars in an airtight container or freezer bag for up to 2 months. Thaw in the refrigerator for several hours or at room temperature for 30 minutes before serving. Add whipped cream after thawing, if desired.
More Recipes You’ll Love
Try other seasonal favorites and citrus-forward treats for more dessert inspiration.
Recipe
Key Lime Pie Bars
- Prep Time: 20 minutes
- Cook Time: 20 minutes
- Total Time: 40 minutes
- Yield: 8–12 bars
- Category: Dessert, Pies, Bars
- Method: Bake
- Cuisine: American
Ingredients
- 28 oz sweetened condensed milk
- 1/2 cup plain Greek yogurt (or sour cream)
- 3/4 cup key lime juice
- 1 3/4 cups graham cracker crumbs (or crushed gingersnaps)
- 2 tablespoons brown sugar
- 6 tablespoons salted butter, melted
- Lime zest, for topping
Instructions
- Preheat oven to 350°F (176°C). Line an 8×8″ baking dish with parchment paper.
- In a medium bowl, combine graham cracker crumbs, brown sugar, and melted butter until evenly moistened.
- Press the crumb mixture into the bottom of the prepared dish using a flat-bottomed cup to compact it.
- Bake the crust for 8–10 minutes. Remove and let cool.
- Whisk together sweetened condensed milk, Greek yogurt (or sour cream), and key lime juice until smooth.
- Pour the filling over the cooled crust and spread into an even layer.
- Bake for 10–12 minutes, until the filling is set but not browned.
- Cool to room temperature, then refrigerate for at least 2 hours or overnight to firm up.
- Slice into 8–12 bars, garnish with lime zest, and serve with whipped cream if desired.
Notes
- If the crust feels too dry to press, add an extra tablespoon of melted butter.
- Dairy-free option: use coconut-based condensed milk, vegan butter/coconut oil in the crust, and dairy-free whipped topping.
- Gluten-free option: use gluten-free cookies for the crust.
LET US KNOW WHAT YOU THINK!
Made these key lime pie bars? Leave a review and tag @bakedabundance on social media to share your photos and tips.