Why You’ll Love Key Lime Fudge Recipe

Key Lime Fudge is not your average fudge recipe. It’s vibrant, tangy, and smooth, offering a perfect balance between sweet and tart. The fresh lime flavor gives it a tropical feel, and the optional graham cracker topping adds a fun, pie-inspired twist. It’s easy to make with simple ingredients, no candy thermometer required, and chills quickly in the fridge. Plus, its light green color makes it an eye-catching addition to any dessert table.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

granulated white sugar
unsalted butter
evaporated milk
white chocolate chips
marshmallow creme
key lime juice (fresh or bottled)
grated lime zest
vanilla extract
green food coloring (optional)
graham cracker crumbs (optional, for garnish)

Directions

Line an 8-inch square baking pan with foil or parchment paper and set aside.
In a medium saucepan, stir together the sugar, butter, and evaporated milk over medium heat until it begins to boil.
Continue boiling the mixture for 5 minutes, stirring constantly to prevent burning.
Remove from heat and stir in the white chocolate chips until fully melted and smooth.
Mix in the marshmallow creme, key lime juice, lime zest, vanilla extract, and food coloring (if using) until fully blended.
Pour the mixture into the prepared pan and spread it evenly.
Optionally, sprinkle graham cracker crumbs on top for a pie-like touch.
Chill in the refrigerator for at least 2 hours until the fudge is firm.
Lift out of the pan, slice into squares, and serve.
Store leftovers in an airtight container in the fridge.

Servings and timing

This recipe makes about 36 small squares.
Preparation time: 15 minutes
Chill time: 2 hours
Total time: 2 hours 15 minutes

Variations

Coconut Lime Fudge: Add 1/2 cup of shredded coconut for a tropical variation.
Lime and Lemon Mix: Use a combination of lime and lemon juice for a citrus blend.
Key Lime Pie Fudge Bars: Press a graham cracker crust into the pan before pouring the fudge on top for a true pie-inspired treat.
Vegan Version: Use vegan butter, dairy-free white chocolate chips, and a vegan marshmallow creme alternative.
Stronger Green Color: Use more food coloring for a bolder visual impact.

Storage/Reheating

Store the fudge in an airtight container in the refrigerator for up to 1 week. For longer storage, freeze it in a sealed container or freezer bag for up to 2 months. Let frozen fudge thaw in the fridge overnight before serving. This fudge is best served chilled, and no reheating is necessary.

FAQs

What does key lime fudge taste like?

It tastes creamy and sweet with a bright, tangy flavor from the key lime juice, similar to key lime pie.

Can I use regular lime juice instead of key lime juice?

Yes, regular lime juice works fine, though key limes have a slightly more floral and tart flavor.

Do I need a candy thermometer for this fudge?

No, this recipe does not require a candy thermometer. Just follow the boil time instructions.

Can I make this fudge without food coloring?

Absolutely. The food coloring is only for appearance and does not affect the taste.

How long does key lime fudge take to set?

It typically takes about 2 hours in the fridge to become firm enough to cut into squares.

Can I use bottled lime juice?

Yes, bottled key lime juice is a convenient option if fresh key limes aren’t available.

Is this fudge overly sweet?

The sweetness is balanced by the tart lime juice, but you can reduce the sugar slightly if desired.

Can I double the recipe?

Yes, double the ingredients and use a 9×13-inch pan for a larger batch.

How do I cut fudge cleanly?

Use a sharp knife dipped in hot water and wiped dry between cuts for clean edges.

Is this a good make-ahead dessert?

Yes, it stores well and can be made several days in advance for parties or holidays.

Conclusion

Key Lime Fudge is a deliciously different take on traditional fudge, offering a bright citrus flavor paired with creamy sweetness. It’s easy to prepare, no-fuss, and perfect for any occasion. Whether you’re making it for a summer gathering or simply to satisfy a sweet craving, this zesty fudge will leave a lasting impression.