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Key Lime Fudge

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close up shot of a slice of Key Lime Fudge on a wooden cutting board with a slice taken out
Creamy and bursting with citrusy tanginess, this key lime fudge is a refreshing and sweet treat that comes together in no time.
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Table of Contents
  1. Key Lime Fudge Ingredients
  2. How to Make This Key Lime Fudge Recipe
  3. How To Serve
  4. Storage
  5. More Recipes You’ll Love
  6. JUMP TO RECIPE

Your tastebuds will come alive with this tangy and sweet key lime fudge. Made on top of a buttery graham cracker crust, the classic creamy fudge is infused with citrusy bursts of tropical key lime flavors.

a close up shot of key lime fudge stacked on top of each other on a wooden board

Key Lime Fudge Ingredients

Key Lime Fudge raw ingredients that are labeled

You’ll need:

For the Crust

  • 1½ cups crushed graham cracker crumbs (1 sleeve graham crackers)
  • 6 tablespoons salted sweet cream butter, melted
  • 2 tablespoons granulated sugar

For the Key Lime Fudge

  • 2⅓ cups white premium baking chips (like Ghirardelli)
  • 1 (14-ounce) can of sweetened condensed milk
  • 2 tablespoons fresh lime zest plus 1 teaspoon for optional garnish
  • ¼ cup key lime juice (freshly squeezed or bottled)

SUBSTITUTIONS AND ADDITIONS

LIME ZEST: You can add 1 teaspoon of lime zest to the graham cracker crumbs before baking for an extra zing.

KEY LIME JUICE: You can use either fresh squeezed and strained lime juice or bottled key lime juice in this easy recipe.

LIMES: Either key lime juice or regular lime juice work fine for this easy key lime fudge recipe. They can be substituted 1:1.

How to Make This Key Lime Fudge Recipe

For the Crust

STEP ONE: Preheat the oven to 350°F. Line an 8×8-inch baking dish with parchment paper, allowing the edges to hang over the sides for easy removal from the pan. Set it aside.

STEP TWO: Using a small mixing bowl, stir together the graham cracker crumbs, melted butter, and granulated sugar. Stir until well incorporated.

OUR RECIPE DEVELOPER SAYS

If you need to crush your graham crackers, you can toss them in the food processor or crush them in a Ziploc with a rolling pin until they are fine crumbs.

graham crumbs, butter, and sugar stirred together in a bowl

STEP THREE: Evenly press the crust into the bottom of the prepared pan. Bake for 5 minutes. Allow the crust to cool completely.

PRO TIP:

Oven temperatures vary and may need to be recalibrated periodically to ensure they are accurate. Make sure to keep a close eye on your crust as the suggested baking time approaches.

crust pressed into the bottom of the baking dish

For the Key Lime Fudge

STEP ONE: Using a medium-sized heat-safe mixing bowl, add the white chocolate chips and the sweetened condensed milk. Heat in the microwave for 45 seconds, stir and continue heating for 15-second intervals until the mixture is smooth.

white chocolate and sweetened condense milk heated in a bowl

STEP TWO: Add the lime zest and the key lime juice. Stir until the mixture is smooth.

PRO TIP:

If you are using fresh-squeezed key lime juice, be sure to strain the juice before adding it to the fudge.

lime juice and lime zest stirred in a bowl

STEP THREE: Spread mixture in an even layer over the graham crust. Evenly sprinkle the 1 teaspoon of reserved lime zest on top of the fudge. Loosely cover with plastic wrap and let fudge chill in the refrigerator for 2 hours to set.

PRO TIP:

If you prefer, you can also sprinkle a ½ teaspoon of crushed graham crackers on top of the key lime pie fudge along with the lime zest.

lime juice mixture spread over the crust in a baking dish

STEP FOUR: Grasp the edges of the parchment paper and lift the fudge out of the square pan onto a cutting board.

STEP FIVE: Carefully slice the fudge into 36 (1½-inch x 1½-inch) squares. Keep the fudge refrigerated until you are ready to serve.

How To Serve

Enjoy this delightfully rich and creamy fudge anytime you need a little burst of sweetness. Add a refreshing cold vanilla latte or iced caramel macchiato to wash your treat down. This fudge would also be a great homemade gift idea, added to a fancy box and tied with a ribbon.

Our tiger fudge and cookie dough fudge are two more easy fudge recipes that you won’t be able to resist.

Storage

IN THE FRIDGE: Keep any leftovers in an airtight container in the refrigerator for up to 2 weeks. 

IN THE FREEZER: You can freeze the fudge for up to 2 months. Lay the fudge in a single layer, wrap in parchment paper, then wrap in aluminum foil. Allow the fudge to thaw in the refrigerator before serving.

close up shot of key lime fudge sliced into squares on a wooden board

This dreamy creamy fudge is bursting with the refreshing flavor of key lime and sweet white chocolate goodness. The hints of tropical destinations make this an ideal fudge to make when you are looking for a little getaway, even if it is just in your imagination.

FREQUENTLY ASKED QUESTIONS

How do I store this fudge?

The best way to store this simple recipe is in the fridge for up to a week or in the freezer for up to three months.

How do I slice through chilled fudge easily? 

An easy way to slice this easy treat is to dip a large sharp knife in hot water, dry it completely, and cut one long slice (the heat will help the blade to glide through).

What is the difference between key limes and regular limes?

Key limes, also known as Mexican limes, are smaller than regular limes and tend to have a more intense lime flavor. You can use key lime juice and regular lime juice interchangeably.

Can I use regular limes if I can’t find fresh key limes?

This key lime pie fudge recipe will be great with any type of fresh lime juice or even bottled lime juice.

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close up shot of a slice of Key Lime Fudge on a wooden cutting board with a slice taken out

Key Lime Fudge

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Creamy and bursting with citrusy tanginess, this key lime fudge is a refreshing and sweet treat that comes together in no time.
Prep Time 10 minutes
Cook Time 10 minutes
Total Time 2 hours 20 minutes
Servings 36

Ingredients
  

Crust

  • cups crushed graham cracker crumbs, 1 sleeve graham crackers
  • 6 tablespoons salted sweet cream butter, melted
  • 2 tablespoons granulated sugar

Key Lime Fudge

  • 2⅓ cups white premium baking chips, like Ghirardelli
  • 14 ounces of sweetened condensed milk
  • 1 teaspoon lime zest, optional garnish
  • 2 tablespoons fresh lime zest
  • ¼ cup key lime juice, fresh squeezed -or- bottled

Instructions
 

Crust

  • Preheat the oven to 350°F. Line an 8×8-inch baking dish with parchment paper, allowing the edges to hang over the sides for easy removal from the pan. Set it aside.
  • Using a small mixing bowl, stir together the graham cracker crumbs, melted butter, and granulated sugar. Stir until well incorporated.
  • Evenly press the crust into the bottom of the prepared baking dish. Bake for 5 minutes. Allow the crust to cool completely.

Key Lime Fudge

  • Using a medium-sized heat-safe mixing bowl, add the white baking chips and the sweetened condensed milk. Heat in the microwave for 45 seconds, stir and continue heating for 15-second intervals until the mixture is smooth.
  • Add the lime zest and the key lime juice. Stir until the mixture is smooth.
  • Evenly spread the fudge over the graham crust. Evenly sprinkle the 1 teaspoon of reserved lime zest on top of the fudge. Loosely cover and chill in the refrigerator for 2 hours to set.
  • Grasp the edges of the parchment paper and lift the fudge out of the pan onto a cutting board.
  • Carefully slice the fudge into 36 (1½-inch x 1½-inch) squares. Keep the fudge refrigerated until you are ready to serve.

Notes

  • If you need to crush your graham crackers, you can toss them in the food processor or crush them in a Ziploc with a rolling pin until they are fine crumbs.
  • Oven temperatures vary and may need to be recalibrated periodically to ensure they are accurate. Make sure to keep a close eye on your crust as the suggested baking time approaches.
  • If you are using fresh-squeezed key lime juice, be sure to strain the juice before adding it to the fudge.
  • If you prefer, you can also sprinkle a ½ teaspoon of crushed graham crackers on top of the key lime pie fudge along with the lime zest.

Nutrition

Calories: 126kcal | Carbohydrates: 17g | Protein: 1g | Fat: 7g | Saturated Fat: 4g | Polyunsaturated Fat: 1g | Monounsaturated Fat: 1g | Trans Fat: 1g | Cholesterol: 9mg | Sodium: 54mg | Potassium: 50mg | Fiber: 1g | Sugar: 8g | Vitamin A: 88IU | Vitamin C: 1mg | Calcium: 35mg | Iron: 1mg
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