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Witches Brew Halloween Cake Jars – A Spooky & Fun Dessert

Halloween is the perfect excuse to get playful in the kitchen, and nothing says festive quite like these Witches Brew Halloween Cake Jars. Think layers of moist black cocoa cake, neon-green frosting, and sprinkles, all nestled inside clear jars that show off their spooky, magical charm. These cake jars are as fun to assemble as they are to eat. The deep, dark black cake pairs perfectly with sweet and buttery frosting dyed a witchy electric green. With fondant decorations on top — like pumpkins, bats, or witch hats — they’re as much a decoration as they are a dessert. The best part? They’re portable, customizable, and guaranteed to cast a spell on your guests!
Print Recipe Pin Recipe
Prep Time 30 minutes
bake & Decorating & Assembly time 50 minutes
Total Time 1 hour 20 minutes
Servings: 10 jars
Ingredients Equipment Method Notes

Ingredients
  

🥚 Fresh Produce:
  • 6 eggs
🌾 Dry & Pantry:
  • 330 g self-raising flour
  • 1 ½ tsp baking powder
  • 30 g unsweetened black cocoa powder
  • 360 g granulated sugar
  • 800 g powdered sugar
  • ½ tsp salt
  • 3 ¼ tsp vanilla extract
  • 3 drops electric green food coloring
  • 1 sprinkles mix Halloween-themed
🥛 Dairy:
  • 360 g unsalted butter for cake & frosting
  • 400 g salted butter for frosting
  • 90 ml milk
  • 2 tbsp milk or cream
🎃 Fondant Decorations:
  • 250 g orange fondant
  • 200 g black fondant
  • 1 tbsp CMC powder to stiffen fondant for shapes

✨ Kitchen Essentials You’ll Love

Quick picks I trust for better results, faster prep, and easier cleanup.

  • 🍳

    Lodge Seasoned Cast Iron Skillet

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  • ⚡

    Instant Pot Duo Plus 9-in-1 Electric

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  • 🔥

    CHEFMAN Digital Air Fryer XL 10L

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Disclosure: As an Amazon Associate, I earn from qualifying purchases at no extra cost to you.

Equipment

  • Mixing bowls
  • Electric mixer or stand mixer
  • Measuring cups & spoons
  • 9x13-inch baking pan
  • Cooling rack
  • Round cutter (to cut cake layers for jars)
  • Piping bags
  • Clear jars with lids (8–10 oz size works best)

Method
 

Step 1 – Make the Cake
  1. Preheat oven to 350°F (175°C). Grease and line a 9x13-inch pan.
  2. In a bowl, whisk flour, baking powder, cocoa powder, and salt.
  3. In a large bowl, beat together butter and granulated sugar until light and fluffy.
  4. Add eggs one at a time, then vanilla.
  5. Gradually fold in dry mixture, alternating with milk, until smooth.
  6. Pour into prepared pan and bake for 25–30 minutes, or until a toothpick comes out clean.
  7. Cool completely, then cut into circles with a cutter that fits your jars.
Step 2 – Make the Frosting
  1. Beat salted butter and unsalted butter together until creamy.
  2. Gradually add powdered sugar, then milk/cream and vanilla.
  3. Tint frosting with electric green food coloring until you achieve a spooky neon shade.
Step 3 – Assemble the Jars
  1. Place one cake round at the bottom of a jar.
  2. Pipe a layer of green frosting on top.
  3. Add another cake layer, followed by more frosting.
  4. Continue layering until jars are full, ending with frosting on top.
Step 4 – Decorate
  1. Add Halloween sprinkles on top.
  2. Shape orange and black fondant into pumpkins, bats, or witch hats using CMC powder to help them hold form.
  3. Place fondant decorations on each jar for a spooky finish.

Notes

🧊 Storage & Reheating
Store jars covered in the refrigerator for up to 4 days.
Bring to room temperature before serving for best flavor.
These jars travel well — perfect for parties or gifting!
🥄 Variations
Purple Frosting: Swap green for purple or orange frosting for variety.
Candy Filling: Add mini M&Ms or candy corn between cake layers for a surprise.
No Fondant? Use edible googly eyes or chocolate decorations instead.
Gluten-Free: Swap self-raising flour with a gluten-free 1:1 substitute.
❓ 10 FAQs
Do I need special jars?
Clear glass or plastic jars work — just ensure they have lids.
Can I make this ahead?
Yes! Assemble 1–2 days in advance and store in the fridge.
Do I need to use black cocoa powder?
It gives a deeper “witchy” look, but regular cocoa works too.
Can I skip the fondant decorations?
Absolutely, just add sprinkles or candy eyes instead.
How do I make it kid-friendly?
Let kids decorate their own jars with sprinkles and candies.
Can I freeze cake jars?
Freeze cake layers separately; assemble fresh after thawing.
Do I need CMC powder for fondant?
It helps stiffen fondant shapes, but you can skip it if not sculpting.
Can I make cupcakes instead of jars?
Yes! Just bake the batter in cupcake liners.
What’s the best butter to use?
A mix of salted and unsalted balances flavor, but you can use all unsalted.
How long can they sit out at a party?
Up to 2 hours; then refrigerate leftovers.
🏁 Conclusion
These Witches Brew Halloween Cake Jars are the ultimate spooky dessert — moist layers of black cocoa cake, neon-green frosting, and creepy-cute fondant decorations. Perfectly portioned and irresistibly festive, they’re guaranteed to wow your guests at any Halloween gathering.