Key Lime Pie Fudge

Key lime pie fudge

The Spruce / Elizabeth LaBau

Prep: 35 mins
Cook: 0 mins
Total: 35 mins
Servings: 9 servings
Nutrition Facts (per serving)
582 Calories
27g Fat
79g Carbs
9g Protein
Show Full Nutrition Label Hide Full Nutrition Label
Nutrition Facts
Servings: 9
Amount per serving
Calories 582
% Daily Value*
Total Fat 27g 35%
Saturated Fat 16g 78%
Cholesterol 54mg 18%
Sodium 244mg 11%
Total Carbohydrate 79g 29%
Dietary Fiber 1g 3%
Protein 9g
Calcium 274mg 21%
*The % Daily Value (DV) tells you how much a nutrient in a food serving contributes to a daily diet. 2,000 calories a day is used for general nutrition advice.
(Nutrition information is calculated using an ingredient database and should be considered an estimate.)

Turn key lime pie into fudge with this easy recipe! This Key Lime Pie Fudge takes the classic flavors of key lime pie and recreates them in fudge form. Creamy white chocolate fudge, flavored with lime zest and fresh lime juice, sits atop a crunchy graham cracker crumb crust.

This recipe tastes best if you use good-quality white chocolate, but you can substitute white chocolate chips if that's what you have on hand. Key limes are different from Persian limes (the standard grocery store lime). Key limes are smaller and seedier, have a higher acidity, a stronger scent, and a thinner rind than a Persian lime. They are picked when they are green but key limes turn yellow when ripe. If possible, use key limes for this recipe. If you cannot find fresh key limes, many grocery stores sell bottled key lime juice. If that's not available, standard (Persian) limes will work.


  • 1/4 cup (4 tbsp, or 2 oz) butter
  • 1/4 cup granulated sugar
  • 1 1/4 cup graham cracker crumbs (from about 10 rectangles)
  • 20 oz. chopped white chocolate (about 3-1/2 cup)
  • 14 oz. can sweetened condensed milk
  • 1/4 tsp salt
  • 2 tbsp. finely grated lime zest
  • 3 tbsp. freshly squeezed lime juice

Steps to Make It

  1. Preheat your oven to 375 F / 190 C. Prepare a 9 x 9 pan by lining it with aluminum foil and spraying the foil with nonstick cooking spray.

  2. Place the butter in a medium microwave-safe bowl and microwave it until it is melted. Once melted, stir in the sugar and graham cracker crumbs until everything is moistened and is the texture of wet sand.

  3. Scatter the crumbs in the bottom of the prepared pan, and press them into an even layer. Bake the bottom crust for 5 minutes, until it is fragrant and lightly colored along the sides. Remove from the oven and cool while you prepare the rest of the fudge.

  4. Place the chopped white chocolate, the sweetened condensed milk, and the salt in a large microwave-safe bowl, and microwave it in 30-second increments, stirring after every 30 seconds. Continue to microwave until the white chocolate is completely melted and your mixture is smooth.

  5. Add the lime juice and lime zest to the white chocolate and stir to incorporate it.

  6. Scrape the fudge into the prepared pan and smooth it into an even layer on top of the graham cracker crust. Refrigerate the fudge until it is completely set, for about 2 to 3 hours or overnight.

  7. Once set, remove it from the pan using the foil as handles. Use a large sharp knife to cut it into 1-inch squares. It helps to rinse the knife in hot water periodically to get cleaner cuts.

  8. Store Key Lime Pie Fudge in an airtight container in the refrigerator for up to two weeks. For best taste and texture, let it sit at room temperature for 20 minutes before serving.

Recipe Tags: