Copycat Burger King Franken-Candy Sundae Recipe

If you’re the kind of person who lives for Halloween menu drops, this Burger King Franken-Candy Sundae copycat is your sweet spot. It’s loud, colorful, and just a little chaotic, in the best way. You’ve got creamy vanilla soft-serve swirled into a frosty peak, dripping with electric-purple fudge and topped with fizzy, crackling popping candy that explodes like haunted fireworks on your tongue. Every spoonful is crunchy, melty, crackly, and wild, just like a perfect Halloween night.

Burger King hasn’t officially released the sundae as of writing, but leaks and patterns from their past seasonal treats give us all the clues we need. Think back to their Spider-Verse Sundae, Morticia’s Kooky Shake, and that epic Viking Sundae with green and black cookie crumble. Combine those, add a bolt of purple fudge and a crackle of candy pop, and you’ve got something that feels like it was stitched together in a candy lab by Dr. Frankenstein himself.

This copycat recipe brings all the fun home, no drive-thru required. Bonus? It’s super customizable, whether you want a grape twist, extra crunch, or a dairy-free freakshow of your own making.

How to make a Burger King Franken-Candy Sundae

Start with a soft, scoopable vanilla ice cream base and blend it just enough with a splash of milk to mimic that classic BK soft-serve texture. While it chills, whip up a glossy, purple-hued white chocolate fudge sauce. It’s rich, sweet, and dramatically violet thanks to a few drops of gel coloring.

From there, you’ll drizzle that glowing syrup into your cup, swirl in the ice cream, and layer on crushed black cookies, neon green crumbs, and your grand finale: popping candy that crackles with every bite. Serve it fast, before the pop fades, and enjoy the magic while it lasts.

Nutrition facts (per 1 sundae, ~150 g)

• Calories: 375
• Total Fat: 17 g
• Saturated Fat: 10 g
• Carbohydrates: 48 g
• Sugar: 39 g
• Protein: 5 g

Ingredients (1 sundae, ~150 g)

Prep Time: 10 minutes
Cook Time: 2 minutes
Total Time: 12 minutes
Servings: 1

Soft-serve base

• 1½ cups vanilla ice cream (low butterfat or “soft-serve style” if available)
• 2 tbsp whole milk (cold)
• ½ tsp vanilla extract

Purple fudge sauce

• 3 oz white chocolate, chopped
• 2 tbsp heavy cream
• 2 tbsp sweetened condensed milk
• ¼ tsp vanilla extract
• ⅛ tsp cake batter extract (optional but amazing)
• Purple gel food coloring (start with 1 drop)
• Pinch of fine salt

Toppings

• 1 tbsp crushed chocolate cookie crumbs (e.g. Oreo wafers, no filling)
• 1 tbsp green-dyed cookie crumbs (see instructions)
• 1 packet grape or green apple Pop Rocks (or similar popping candy)
• Optional: extra purple sauce for drizzling

Tools you’ll need

• Blender or hand mixer
• Microwave-safe bowl
• Small spoon or offset spatula
• Parchment paper or plate for crumbs
• Clear sundae cup or small bowl
• Ice cream scoop
• Straw or long spoon

Instructions

1. Make the green cookie crumbs (5 min)

Melt 1 oz green candy melts in a microwave-safe bowl, then mix in half of your crushed cookie crumbs. Spread thin on parchment, let set, then break into chunky green crumbs.

2. Blend soft-serve base (1 min)

In a blender or mixing bowl, combine the vanilla ice cream, cold milk, and vanilla extract. Blend or whip just until smooth and fluffy but not liquid. Freeze briefly while prepping the sauce.

3. Make purple fudge sauce (2 min)

In a microwave-safe bowl, combine white chocolate and heavy cream. Microwave in 20-second bursts at 50% power, stirring between, until melted and smooth. Add sweetened condensed milk, vanilla, cake batter extract (if using), and salt. Tint with purple gel food coloring until it’s vibrantly violet. Keep warm but not hot.

4. Decorate the cup (optional, 1 min)

Spoon a little warm fudge inside your sundae cup and swirl it around for a ghostly purple trail.

5. Build the sundae (2 min)

Scoop or pipe in the soft-serve. Top generously with warm purple fudge, then scatter on black cookie crumbs and green cookie crumbs.

6. Add popping candy and serve (1 min)

Just before serving, open your Pop Rocks packet and sprinkle over the top. Don’t wait, they fizzle quickly once exposed to air or moisture. Add a final drizzle of fudge if you like and serve immediately.

Tips

• Keep Pop Rocks sealed until the last moment. Moisture kills the pop.
• Use gel food coloring instead of liquid to avoid watering down your fudge.
• Chill your serving cup in the freezer for 10 minutes for that just-out-of-BK look.
• Blend ice cream lightly. Too much air, and it’ll melt fast. Just enough to fluff.
• Try cake batter extract if you want that birthday cake edge BK sometimes sneaks into their shakes.

What to serve with

Trick-or-treat nibbles

• Mini peanut butter cups or candy corn on the side make it feel like a full Halloween dessert board. Toss them in a bowl next to your sundae and let people mix and match.
• Caramel-dipped pretzel sticks offer a salty contrast and a crunch that holds up well next to the meltiness of the sundae.
• Chocolate bark with Halloween sprinkles (either store-bought or homemade) adds visual drama and a satisfying snap. Perfect for dipping into leftover fudge.

Savory spooks

• Burger sliders or hot dogs in crescent roll mummies: lean into the Halloween theme with salty bites that balance out the sugar bomb of the sundae.
• Seasoned waffle fries: Burger King’s own pairing for many sundaes. The crispy, salty fry dipped in sweet fudge? Weirdly perfect.
• Popcorn with green matcha salt or cheddar dust: a fun way to keep fingers busy and tastebuds guessing between cold sweet spoonfuls.

Warm comforts

• Pumpkin bread or cinnamon muffins: the spice and warmth of these treats anchor the sugar rush in something cozy.
• Spiced chai or hot apple cider: a warm drink next to your cold sundae gives contrast that feels like fall in every bite and sip.

Variations

Grape Lab Sundae
Use grape-flavored Pop Rocks and swap the cake batter extract in your fudge for a drop of grape candy oil. The whole thing takes on a weird-scientist-went-fruity vibe.

Dairy-Free Zombie Sundae
Use a plant-based vanilla ice cream (like oat or coconut), swap the fudge cream for full-fat coconut cream, and go heavy on crunchy toppings. Use a coconut-based whip or leave it minimalist.

Monster Mash Sundae
Top the sundae with gummy worms, candy eyes, or crumbled Halloween cookies for a full-on Frankenstein party. Fun to make with kids, or when you just want to go over the top.

Minty Ghoul Sundae
Add ½ tsp mint extract to the purple fudge for an unexpected fresh zing. Pair with dark chocolate cookie crumbs for a Thin Mint feel.

Boozy Frankenstein
Add a teaspoon of creme de menthe or a shot of marshmallow vodka into the fudge before drizzling. It’s subtle, sweet, and very grown-up spooky.

Ingredient Substitutes

Vanilla Ice Cream
Original: Low butterfat vanilla
Substitutes: Frozen yogurt, dairy-free vanilla ice cream, soft-serve mix, or banana-based “nice” cream for a lighter twist

Whole Milk
Original: Whole milk
Substitutes: 2% milk, half-and-half, almond milk, oat milk, evaporated milk for extra richness

White Chocolate
Original: White chocolate chips or baking squares
Substitutes: Almond bark (vanilla flavor), candy melts, or even white frosting thinned with cream (not ideal but works in a pinch)

Sweetened Condensed Milk
Original: Standard canned
Substitutes: Evaporated milk + 1 tsp sugar, or omit and add 1 tbsp extra cream and sugar

Purple Food Coloring
Original: Gel food coloring
Substitutes: Mix red and blue gel food coloring, or try butterfly pea powder for a natural lavender hue (though less vivid)

Popping Candy
Original: Pop Rocks (grape or green apple)
Substitutes: Strawberry Pop Rocks, crackle candy chocolate bars broken up, or chocolate-coated popping candy if moisture is an issue

Crushed Cookies
Original: Oreo wafers, cream removed
Substitutes: Chocolate graham crackers, chocolate wafer cookies, crushed brownie brittle, or thin mints

Green Candy Melts
Original: Colored candy melts
Substitutes: White chocolate dyed green with oil-based food coloring, or skip and use green sanding sugar