Key Lime Cheesecake Bars

Name: Key Lime Cheesecake Bars
Prep time: 15 min
Cook time: 30 min
Total time: 3 h 15 min
Cuisine: American
Ingredients: 12 full-sheet graham crackers, crushed into fine crumbs; 6 tablespoons unsalted butter, melted; 1/4 cup granulated sugar; 4 ounces full-fat brick cream cheese, softened; 4 large egg yolks; 1 can (14 ounces) sweetened condensed milk; 1/2 cup key lime juice; 2 teaspoons lime zest; Optional for garnish: whipped cream and lime slices

Bright, tangy, and indulgently creamy, these Key Lime Cheesecake Bars are a sunny twist on classic cheesecake that bake up in a single square pan. The crisp graham cracker crust gives way to a silky, slightly jiggly lime filling made with full-fat cream cheese, rich sweetened condensed milk, and fresh key lime juice and zest. The aroma is clean and citrusy, with a buttery backdrop from the crust, and the texture balances a tender, custardy center with a satisfying crumb. These bars are ideal for warm-weather gatherings, potlucks, casual after-dinner treats, or any time you want a refreshing dessert that is easy to portion and serve. If you enjoy small-format citrus desserts, try the heavenly no-bake mini key lime pies for another easy option.

Ingredients

12 full-sheet graham crackers, crushed into fine crumbs
Helpful for a sturdy, buttery crust that holds together when pressed into the pan. Using full-sheet crackers yields the right volume of crumbs.
6 tablespoons unsalted butter, melted
Binds the graham crumbs and adds richness. Melt and cool slightly before combining.
1/4 cup granulated sugar
Sweetens the crust and helps it crisp during prebake.
4 ounces full-fat brick cream cheese, softened
Provides the creamy, tangy base for the filling. Room temperature cream cheese blends smoothly.
4 large egg yolks
Thicken and stabilize the filling for a custard-like finish. Use only yolks as called for in the recipe.
1 can (14 ounces) sweetened condensed milk
Adds sweetness and silkiness while reducing the need for extra sugar in the filling.
1/2 cup key lime juice
Fresh key lime juice gives the bright, tart flavor that defines these bars. Measure carefully.
2 teaspoons lime zest
Adds concentrated lime aroma and a burst of citrus oil on top of the juice.
Optional for garnish: whipped cream and lime slices
These add a light, creamy contrast and a pretty finish when serving chilled.

If you prefer a lemony variation, consider the easy zesty two-ingredient lemon bars for a similar approach with lemon.

Step-by-step Instructions

Preheat the oven to 350°F (177°C). Line a 9-inch square baking pan with parchment paper, leaving an overhang for easy lifting. This makes removing and slicing the bars much easier.
Grind the graham crackers into fine crumbs and combine with the granulated sugar and melted butter. Use a food processor or place crackers in a sealed bag and crush with a rolling pin until very fine.
Press the crumb mixture firmly and evenly into the bottom of the prepared pan to form the crust. Press using the bottom of a measuring cup for an even layer.
Prebake the crust for 10 minutes. This step helps set the crust so it does not become soggy under the filling.
In a separate bowl, beat the softened cream cheese until smooth using a hand mixer or whisk. Add the egg yolks one by one, mixing well after each addition until fully incorporated.
Gradually mix in the sweetened condensed milk, key lime juice, and lime zest until the filling is smooth and homogeneous. Scrape the bowl to ensure no lumps remain.
Pour the filling over the prebaked crust and bake for 18 to 20 minutes, until the center is set but still slightly jiggly. The edges should be just firm to the touch.
Allow the pan to cool at room temperature for 30 minutes, then chill in the refrigerator for 2 to 3 hours before cutting into squares. For neat slices, use a warm, clean knife and wipe between cuts. If you love bar-style desserts, you might also enjoy the chocolate peanut butter oatmeal bars as another portable treat.

Recipe Details

Prep Time: 15 minutes
Cook Time: 28 to 30 minutes (10 minutes prebake plus 18 to 20 minutes bake)
Total Time: About 3 hours 15 minutes to 4 hours 15 minutes, including chilling
Servings: 16 bars
Calories: Approximately 210 calories per bar (based on 16 servings)

Tips, Storage & Variations

Tips
- Soften the cream cheese at room temperature for 30 to 60 minutes to avoid lumps.
- Press the crust tightly and evenly for a stable base. A flat measuring cup bottom works well.
- Do not overbake the filling. It should be slightly jiggly in the center when you remove it from the oven. It will firm up while chilling.
Storage
- Refrigerate in an airtight container for up to 4 days. Place parchment paper between layers to prevent sticking.
- For transport, keep bars chilled and on ice if possible to maintain texture.
Freezing
- Freeze cooled bars in a single layer on a baking sheet until firm, then wrap tightly and store in a freezer-safe container for up to 2 months. Thaw overnight in the refrigerator before serving.
Flavor variations using only the listed ingredients
- Extra zesty: Stir an additional 1/2 to 1 teaspoon lime zest into the filling for more citrus aroma.
- Brighter crust: Add up to 1 tablespoon more granulated sugar to the crust if you like a sweeter base.
- Garnish focus: Top each chilled square with whipped cream and a thin lime slice for a classic presentation.
  For a different cheesecake bar idea, see caramel apple cheesecake bars.

Frequently Asked Questions

Q: Can I use regular limes instead of key limes?
A: Yes, regular limes will work. The flavor will be slightly less floral but still bright and delicious.

Q: Why is the filling slightly jiggly when it comes out of the oven?
A: The filling sets as it cools. A slight jiggle indicates it is creamy and not overbaked.

Q: Can I use low-fat cream cheese?
A: Low-fat cream cheese may change the texture and richness. Full-fat yields the best creamy result.

Q: How long should I chill the bars before serving?
A: Chill for 2 to 3 hours for firm slices. Cooling at room temperature for 30 minutes first improves texture.

Q: Can I make these ahead for a party?
A: Yes, make them a day in advance and keep refrigerated. They hold well and slice neatly when chilled.

Q: What is the best way to cut neat squares?
A: Use a warm, sharp knife and wipe the blade between cuts for clean edges.

Conclusion

These Key Lime Cheesecake Bars are a fuss-free way to deliver big citrus flavor and creamy texture in every bite. They are perfect for summer gatherings, make-ahead desserts, and any time you want a slice of bright, creamy indulgence. If you want to compare similar recipes or find more inspiration, check out Entertaining with Beth’s Key Lime Cheesecake Bars for another take, and browse Sally’s Baking Addiction Easy Key Lime Pie Bars for a related bar-style lime dessert. I hope you enjoy making and sharing these bars with friends and family.