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A piece of key lime fudge with a bite taken out of it.

Key Lime Fudge

This fudge is really simple and doesn’t take long at all. It's a sweet treat boasts the tangy flavor of key lime in every delicious bite.
Prep Time:35 mins
Cook Time:5 mins
Chilling Time:2 hrs
Total Time:2 hrs 40 mins
Servings:16 1-inch squares


  • ¼ cup unsalted butter
  • ¼ cup granulated sugar
  • 1 ¼ cup graham cracker crumbs
  • ¼ teaspoon salt
  • 3 ½ cup white chocolate chopped
  • 14 ounces sweetened condensed milk
  • 2 tablespoons lime zest finely grated
  • 3 tablespoons lime juice freshly squeezed


  • Preheat oven to 375°F and line 9 x 9-inch pan with aluminum foil. Grease the foil with nonstick spray.
  • Melt the butter in the microwave. Once melted, add graham crackers and sugar. Stir them until it forms a texture the resembles wet sand.
  • Now take the prepared pan and scatter the crumbs in the bottom. Press them to even the layer.
  • Bake it for 5 minutes. Remove from the oven and let it cool. Start preparing the fudge.
  • Melt the sweetened condensed milk, white chocolate, and salt in the microwave in 30-second increments while stirring in-between until the mixture is smooth.
  • After that, add the lime zest and lime juice to the white chocolate mixture and stir well.
  • Pour the fudge over the crust and smooth it into an even layer.
  • Refrigerate it for at least 2 hours or overnight.
  • Remove it from the pan. Cut into square pieces with the help of a sharp knife. Run the knife under hot water in-between cuts to make clean squares. Enjoy!


  • You can use regular limes if you can't get Key limes.
  • Humid air can affect the results of a fudge recipe. Try to pick a day that isn't overly humid or wet.
  • Use a sharp knife to cut the fudge into squares so the pieces have nice, clean edges. Rinse the blade under hot water in-between cuts to make it even easier!
  • Use milk chocolate if you prefer it to white chocolate. It has a stronger flavor, so use a bit less so you don't overpower the lime flavor.


Calories: 536kcal | Carbohydrates: 69g | Protein: 7g | Fat: 27g | Saturated Fat: 16g | Trans Fat: 1g | Cholesterol: 39mg | Sodium: 289mg | Potassium: 340mg | Fiber: 1g | Sugar: 63g | Vitamin A: 294IU | Vitamin C: 3mg | Calcium: 239mg | Iron: 1mg