Ghoulish Green Macarons with Slime Filling

Servings: 20 Total Time: 1 hr 25 mins Difficulty: Beginner
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Introduction

French macarons are known for their delicate shells, chewy texture, and decadent fillings. But when Halloween rolls around, it’s time to give them a spooky makeover! These Ghoulish Green Macarons with Slime Filling combine the elegance of Parisian patisserie with a playful Halloween twist.

Vibrant green shells sandwiched together with a gooey, bright “slime” filling (made from a sweet white chocolate ganache tinted with neon green food coloring) create the perfect mix of creepy and delicious. The shells are light and crisp, the centers are chewy, and the filling oozes just enough to give that eerie “slime effect.”

Why I Love This Recipe

I love this recipe because it’s unexpected and creative—taking a refined dessert and transforming it into something fun and spooky. Macarons can sometimes feel “fancy,” but dressing them up in Halloween colors makes them more approachable and party-friendly.

The texture is unbeatable: the delicate shells give way to chewy centers and that gooey, sweet, tangy filling. Plus, the bold green color with slime oozing out always gets a big reaction when you serve them. They’re not just cookies—they’re conversation starters.

Why It’s a Must-Try Dish

  • Spooky but Elegant: Perfect balance of creepy-cute and sophisticated.
  • Customizable Colors & Flavors: Endless Halloween variations possible.
  • Party-Worthy: These will instantly elevate any Halloween dessert table.
  • Impressive Yet Fun: Guests will be wowed, and kids will love the slime factor.

Recipe Overview

  • Preparation Time: 40 minutes
  • Resting Time: 30 minutes
  • Cooking Time: 15 minutes
  • Total Time: ~1 hour 30 minutes
  • Servings: About 20 macarons (40 shells)
  • Calories per Macaron: ~100–120 kcal

Cuisine & Course

  • Cuisine: French-inspired Halloween twist
  • Course: Dessert / Party Treat

Ingredients

For the Green Macaron Shells

  • 1 cup (100g) almond flour (finely ground)
  • 1 ½ cups (150g) powdered sugar
  • 3 large egg whites (aged, room temperature)
  • ¼ cup (50g) granulated sugar
  • ½ teaspoon cream of tartar (optional, helps stabilize meringue)
  • 1 teaspoon vanilla extract
  • Neon green gel food coloring

For the Slime Filling (White Chocolate Ganache)

  • ½ cup (120ml) heavy cream
  • 6 oz (170g) white chocolate (chopped or chips)
  • 1 tablespoon unsalted butter
  • Green food coloring (neon or lime green for slime effect)
  • Optional: a few drops of lime extract for tangy flavor

Simple Cooking Directions

  1. Sift almond flour and powdered sugar.
  2. Whip egg whites with sugar until stiff peaks form.
  3. Fold in dry ingredients and green coloring to form batter.
  4. Pipe onto baking sheets, rest, and bake until set.
  5. Make ganache by heating cream, pouring over white chocolate, then adding butter and green coloring.
  6. Pipe ganache between macaron shells for slime effect.

Step-by-Step Preparation Method

Step 1: Make the Macaron Batter

  1. Sift almond flour and powdered sugar together—twice if possible—for smooth shells.
  2. In a clean bowl, whip egg whites until foamy. Add cream of tartar, then gradually add granulated sugar until stiff peaks form.
  3. Add vanilla and green gel food coloring. Mix gently.
  4. Fold dry ingredients into meringue using a spatula (the macaronage technique). Batter should flow like lava and form ribbons.

Step 2: Pipe and Rest

  1. Transfer batter into a piping bag fitted with a round tip.
  2. Pipe small circles (about 1.5 inches) onto parchment-lined baking sheets.
  3. Tap trays to release air bubbles.
  4. Let sit at room temperature for 30–45 minutes until shells form a skin (they should not stick to your finger).

Step 3: Bake the Shells

  1. Preheat oven to 300°F (150°C).
  2. Bake for 12–15 minutes until set and firm.
  3. Cool completely before removing from parchment.

Step 4: Prepare the Slime Filling

  1. Heat cream until just simmering, pour over chopped white chocolate.
  2. Let sit 2 minutes, then stir until smooth.
  3. Add butter and green coloring until vibrant and slime-like.
  4. Chill slightly until it thickens but is still pipeable.

Step 5: Assemble

  1. Match similar-sized shells together.
  2. Pipe slime filling on one shell and gently sandwich with another.
  3. Let macarons mature in the fridge 24 hours for best texture.

How to Serve

  • Arrange on a black or purple platter for spooky vibes.
  • Serve with dry ice or fog machine nearby for a haunted effect.
  • Pair with pumpkin spice lattes, mulled cider, or hot chocolate.

Additional Recipe Tips

  • Aged Egg Whites: Separate eggs and let whites rest in the fridge for 24 hours for stable meringue.
  • Use Gel Coloring: Liquid food coloring may ruin the batter consistency.
  • Macaronage Matters: Don’t overmix or undermix—the right flow is crucial.
  • Ganache Consistency: If too runny, chill longer; if too stiff, warm slightly.

Variations

  • Bloody Macarons: Use red ganache for a gory twist.
  • Monster Eyes: Add candy eyeballs on top with a dot of royal icing.
  • Witch’s Brew Flavor: Add mint or matcha to shells for an earthy green flavor.
  • Pumpkin Spice Macarons: Tint orange and fill with spiced buttercream.

Freezing & Storage

  • Storage: Store filled macarons in an airtight container in the fridge for up to 4 days.
  • Freezing Shells: Freeze unfilled shells for up to 2 months, thaw in fridge before filling.
  • Freezing Filled Macarons: Possible for 2–3 weeks, but filling may soften slightly.

Special Equipment Needed

  • Electric mixer or stand mixer
  • Piping bags with round tips
  • Baking sheets with parchment or silicone mats
  • Kitchen scale (for precise measurements)
  • Sifter for almond flour/powdered sugar

Conclusion

Ghoulish Green Macarons with Slime Filling are the ultimate Halloween showstopper—sophisticated yet spooky. They’re crisp, chewy, gooey, and delicious, with a presentation that steals the spotlight at any party. While macarons may seem intimidating, this recipe breaks it down into simple steps so anyone can succeed.

These little green monsters prove that Halloween treats don’t have to be all sugar and candy—they can also be elegant, impressive, and hauntingly good.

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Ghoulish Green Macarons with Slime Filling

Difficulty: Beginner Prep Time 40 mins Cook Time 15 mins Rest Time 30 mins Total Time 1 hr 25 mins
Servings: 20 Calories: 120 kcal

Description

French macarons are known for their delicate shells, chewy texture, and decadent fillings. But when Halloween rolls around, it’s time to give them a spooky makeover! These Ghoulish Green Macarons with Slime Filling combine the elegance of Parisian patisserie with a playful Halloween twist.

Ingredients

For the Green Macaron Shells

For the Slime Filling (White Chocolate Ganache)

Instructions

  1. Step 1: Make the Macaron Batter : Sift almond flour and powdered sugar together—twice if possible—for smooth shells. In a clean bowl, whip egg whites until foamy. Add cream of tartar, then gradually add granulated sugar until stiff peaks form. Add vanilla and green gel food coloring. Mix gently. Fold dry ingredients into meringue using a spatula (the macaronage technique). Batter should flow like lava and form ribbons.
  2. Step 2: Pipe and Rest : Transfer batter into a piping bag fitted with a round tip. Pipe small circles (about 1.5 inches) onto parchment-lined baking sheets. Tap trays to release air bubbles. Let sit at room temperature for 30–45 minutes until shells form a skin (they should not stick to your finger).
  3. Step 3: Bake the Shells : Preheat oven to 300°F (150°C). Bake for 12–15 minutes until set and firm. Cool completely before removing from parchment.
  4. Step 4: Prepare the Slime Filling : Heat cream until just simmering, pour over chopped white chocolate. Let sit 2 minutes, then stir until smooth. Add butter and green coloring until vibrant and slime-like. Chill slightly until it thickens but is still pipeable.
  5. Step 5: Assemble : Match similar-sized shells together. Pipe slime filling on one shell and gently sandwich with another. Let macarons mature in the fridge 24 hours for best texture.
Keywords: Ghoulish Green Macarons with Slime Filling
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Frequently Asked Questions

Expand All:

Q1: Why do my macarons crack?

Usually from undermixed batter, too much air, or oven too hot. Resting time is key.

Q2: Can I use regular food coloring?

Gel is best—liquid may ruin texture.

Q3: Do I have to use white chocolate?

No, you can use buttercream or cream cheese filling instead, but ganache gives the best slime effect.

Q4: Can I skip aging the egg whites?

It’s optional, but it improves stability for beginners.

Q5: Why should macarons “mature” in the fridge?

They taste better after 24 hours as the filling blends with shells, creating the perfect chewy texture.

Samantha Doe Food and Lifestyle Blogger

Hi, I'm Samantha, a full-time food blogger, mother of 2 beautiful daughters and a lovely wife. I live in New Jersey with my family. Loves traveling, sharing new recipes, and spending time with my family.

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