How to Make the Best Key Lime Pie Bars from Scratch

These Key Lime Pie Bars are everything you love about the classic dessert—tangy, creamy, and just sweet enough—but in a lightened-up, perfectly portioned square. The zesty lime filling rests on a golden graham cracker crust, making every bite a refreshing escape to tropical bliss. They’re the ideal treat for warm-weather gatherings, afternoon cravings, or anytime you need a little citrusy pick-me-up.

Why You’ll Love This Recipe

Fresh and Tangy – Real lime juice and zest bring bold citrus flavor.
Portioned to Share (or Not) – Easy to slice and serve for perfect portions.
Lightened-Up Classic – All the richness you expect with fewer calories.
Chill-Friendly – Best served cold, which makes them ideal for prepping ahead.

Ingredients

For the crust:

• ¾ cup graham cracker crumbs
• 2 tbsp light butter, melted
• 1 tbsp erythritol or preferred sweetener

For the filling:

• 8 oz reduced-fat cream cheese, softened
• ½ cup plain nonfat Greek yogurt
• ⅓ cup fresh lime juice (preferably key limes)
• 1 tbsp lime zest
• ⅓ cup powdered erythritol (or sugar substitute of choice)
• 1 egg
• 1 tsp vanilla extract

Instructions

Preheat and Prepare Pan
Preheat oven to 325°F (163°C). Line an 8×8-inch baking dish with parchment paper or lightly coat with nonstick spray.

Make the Crust
Mix graham cracker crumbs, melted butter, and sweetener in a small bowl. Press evenly into the bottom of the pan. Bake for 6–7 minutes, then let cool slightly.

Make the Filling
In a medium bowl, beat cream cheese until smooth. Add Greek yogurt, lime juice, zest, sweetener, vanilla, and egg. Mix until just combined and smooth—don’t overmix.

Bake the Bars
Pour filling over the crust and smooth the top. Bake for 18–20 minutes or until the edges are set and the center is just slightly jiggly.

Cool and Chill
Let bars cool at room temperature, then refrigerate for at least 2 hours (or overnight) before slicing into 12 bars.

Nutritional Information (Per Bar)

Calories: 105
Protein: 5g
Fat: 5g
Carbohydrates: 9g
Sugar: 3g
Fiber: 1g

Tips for Success

• Use Fresh Limes – The bright, zesty flavor makes all the difference.
• Don’t Skip the Chill – Chilling helps the bars set and enhances the texture.
• Line Your Pan – Parchment paper makes lifting and slicing a breeze.
• Top It Off – Add a tiny swirl of light whipped topping or a lime slice for presentation.

Why This Recipe Works

With a creamy base made from Greek yogurt and reduced-fat cream cheese, plus a refreshing lime twist, these bars offer a vibrant flavor without heavy ingredients. The graham crust adds crunch and a hint of sweetness, creating a perfect contrast to the smooth, tart filling.

Key Lime Pie Bars bring a burst of citrus flavor in a cool, creamy bite that feels indulgent but fits a mindful lifestyle. They’re quick to prepare, simple to serve, and guaranteed to refresh your dessert lineup—one zesty square at a time.