If you’re ready to enchant your taste buds with a fun, festive treat, the Bubbling Witch’s Cauldron Brownies Recipe is exactly what you need. These adorable mini brownies are magically transformed into whimsical cauldrons filled with vibrant green frosting that bubbles and glows with sprinkles, making them the perfect sweet potion for any Halloween celebration or spooky party. Not only do they taste rich and chocolaty, but they also wow with their playful, creative presentation that’s sure to delight both kids and adults alike.

Ingredients You’ll Need
Gathering the ingredients for this recipe is a breeze, and each one plays an essential role in balancing flavor, color, and texture. From the fudgy brownie base to the luscious green buttercream and crunchy sprinkles, these components come together to create a truly magical dessert experience.
- Brownie mix box: The foundation of these treats; a classic fudgy brownie mix provides ease and great flavor.
- Eggs, oil, and water: Usually included with the brownie mix instructions, these help create the perfect brownie batter texture.
- Butter (1 stick/1/2 cup, room temperature): Adds creaminess and richness to the buttercream frosting.
- Powdered sugar (1-2 cups): Sweetens and thickens the frosting to achieve that luscious, spreadable texture.
- Green food coloring (Leaf Green Wilton gel recommended): Brings the cauldron’s bubbling potion to life with a vivid, festive hue.
- Large green nonpareil sprinkles: These big sprinkles add eye-catching bubbles on top of the frosting.
- Small green nonpareil sprinkles: Perfect for creating lots of tiny bubbling effects and a more natural cauldron overflow look.
- Pretzel sticks (optional): Use these as “stir spoons” poking out of the frosting for extra whimsical detail.
How to Make Bubbling Witch’s Cauldron Brownies Recipe
Step 1: Prepare the Brownies
Begin by preheating your oven according to the instructions on your brownie mix box. Spray a mini muffin pan with non-stick cooking spray to ensure easy removal. Prepare the brownie batter by following the box directions, typically combining eggs, oil, and water with the dry mix. Spoon the batter into each mini muffin well until it is about two-thirds full. Bake for 10 to 15 minutes until a toothpick comes out clean from the center.
Step 2: Create Cauldron Indentations
Once out of the oven, quickly use the back of a 1/2 tablespoon to press gently into the center of each brownie to form a perfect little indentation. This will hold the bubbling green frosting later. Let the brownies cool fully in the pan before removing them to avoid any breaks.
Step 3: Make the Green Buttercream Frosting
In a mixing bowl, beat the softened butter with an electric mixer on medium speed until creamy and smooth, about 30 seconds. Gradually add the powdered sugar, continuing to beat until the mixture is thick and fluffy. Add green food coloring a little at a time, mixing thoroughly after each addition until your ideal bright green is achieved. This bubbling potion color is what gives the recipe its festive charm.
Step 4: Assemble the Cauldrons
Once your brownies have cooled, dollop a generous spoonful of green buttercream into each indentation. Use a small spatula or the back of your spoon to create wispy, bubbling peaks and swirls in the frosting to mimic a bubbling potion. Scatter large and small green nonpareil sprinkles both on top and dripping over the edges for an overflowing cauldron look. If you want to get extra creative, place half a pretzel stick into the frosting as a tiny stirring spoon to complete the spooky effect.
How to Serve Bubbling Witch’s Cauldron Brownies Recipe

Garnishes
Adding little touches like edible glitter or black sugar crystals can elevate these brownies, making them sparkle with mysterious potion magic. Fresh mint leaves or a small edible flower can also add a fresh contrast if you want to mix in another layer of presentation.
Side Dishes
Pair these cauldron brownies with a rich hot chocolate or a glass of spiced apple cider for a warm, cozy pairing. For an added surprise, serve alongside some tangy, sharp fruit like sliced green apples or kiwi to balance the sweetness.
Creative Ways to Present
Place the brownies on a dark serving platter with some dry ice nearby (handle safely!) for a fog effect that mimics actual bubbling cauldrons. Another fun idea is to arrange them inside a hollowed-out pumpkin or surrounded by Halloween-themed decorations to set the perfect spooky scene.
Make Ahead and Storage
Storing Leftovers
Store any extra Bubbling Witch’s Cauldron Brownies in an airtight container at room temperature for up to three days. Keep them out of direct sunlight to preserve the vibrant frosting color and prevent it from drying out.
Freezing
If you want to save some for later festivities, freeze the unassembled brownies (just baked and cooled) in a single layer on a baking sheet. Transfer to a freezer-safe container after they freeze solid. Keep frosting separate and assemble after thawing for the best results.
Reheating
Since brownies are best enjoyed at room temperature or slightly cool, you typically don’t need to reheat them. If you prefer warm brownies, gently warm a single brownie in the microwave for about 10 seconds—frosting may soften drastically, so handle carefully.
FAQs
Can I make the frosting ahead of time for the Bubbling Witch’s Cauldron Brownies Recipe?
Absolutely! You can prepare the green buttercream frosting a day in advance and store it tightly covered in the refrigerator. Just give it a quick stir before frosting your brownies to bring it back to a smooth consistency.
What if I don’t have green food coloring gel? Can I use liquid?
While liquid food coloring works, gel is recommended because it provides more vibrant color without thinning your frosting. If you only have liquid, add just a drop or two gradually to avoid making the frosting runny.
Are pretzel sticks necessary for this recipe?
Pretzel sticks are totally optional but highly encouraged! They add a charming “stir spoon” detail that really brings the cauldron theme to life, but the brownies are delicious and festive even without them.
Can I use homemade brownies instead of boxed mix?
Definitely! Any fudge brownie recipe that yields a thick batter will work beautifully for this project. Just bake them in mini muffin pans and follow the same steps to create the cauldron indentations and frosting.
How do I make sure the brownies don’t stick to the pan?
Spraying the mini muffin pan generously with non-stick cooking spray is key. You can also use mini silicone muffin liners for an even easier release. Letting the brownies cool completely before removing them also prevents breakage.
Final Thoughts
If you want a dessert that brings a little magic to your next gathering, the Bubbling Witch’s Cauldron Brownies Recipe is a spellbinding choice. They combine simple ingredients with playful presentation to create an unforgettable treat that everyone will love. Go ahead and try making these brownies—you’ll find the whole process as fun as biting into the rich, bubbly cauldron itself!
Print
Bubbling Witch’s Cauldron Brownies Recipe
- Prep Time: 15 minutes
- Cook Time: 15 minutes
- Total Time: 30 minutes
- Yield: 24 mini brownies
- Category: Dessert
- Method: Baking
- Cuisine: American
Description
These Bubbling Witch’s Cauldron Brownies are a fun and festive treat perfect for Halloween or any spooky celebration. Mini brownie cups are baked and then hollowed out slightly to hold green buttercream frosting that mimics a bubbling witch’s potion, complete with green sprinkles and optional pretzel stick stirrers for extra charm.
Ingredients
Brownies
- 1 box brownie mix (including the ingredients listed on the box, typically eggs, oil, and water)
- Non-stick cooking spray (for greasing the mini muffin pan)
Buttercream Frosting
- 1 stick butter (1/2 cup), room temperature
- 1–2 cups powdered sugar
- Green food coloring (e.g., Leaf Green Wilton gel food coloring)
- Large green nonpareil sprinkles
- Small green nonpareil sprinkles
- Pretzel sticks, broken in half (optional, for “stir spoons”)
Instructions
- Prepare the Brownies: Preheat your oven to the temperature specified on the brownie mix box. Lightly spray a mini muffin pan with non-stick cooking spray to prevent sticking.
- Mix the Brownie Batter: Prepare the brownie mix according to the package instructions, incorporating any eggs, oil, and water as directed.
- Fill the Pan: Spoon the brownie batter into each mini muffin well, filling them about two-thirds full to allow room for rising and indentations.
- Bake: Place the pan in the oven and bake for 10 to 15 minutes, or until a toothpick inserted into the center of a brownie comes out clean.
- Create Cauldron Indentations: Immediately after baking, while the brownies are still warm, use the back of a 1/2 tablespoon to press down the center of each brownie, creating a shallow well for the frosting to sit in.
- Cool the Brownies: Allow the brownies to cool completely in the pan before removing them to prevent breaking.
- Make the Buttercream Frosting: In a medium mixing bowl, beat the room temperature butter with an electric mixer for about 30 seconds until smooth and creamy.
- Add Powdered Sugar: Gradually add 1 to 2 cups of powdered sugar to the butter while beating, until fully combined and smooth.
- Color the Frosting: Add green food coloring a little at a time, mixing well, until you reach your desired vibrant shade of green.
- Assemble the Cauldrons: Once the brownies are fully cooled, spoon a dollop of the green buttercream into the indentation of each brownie.
- Create Bubbling Effect: Use the back of a spoon or spatula to form wispy peaks in the buttercream, mimicking the look of a bubbling potion.
- Decorate with Sprinkles: Sprinkle large and small green nonpareil sprinkles over the frosting for texture and to enhance the bubbling cauldron effect. Allow some frosting and sprinkles to drip slightly down the sides for an overflowing look.
- Add Pretzel Stir Spoons (Optional): Break pretzel sticks in half and insert them into the frosting of each brownie as whimsical “stir spoons.”
Notes
- If desired, adjust the sweetness of the frosting by adding powdered sugar gradually to suit your taste.
- You can substitute regular-sized muffin pans if mini muffin pans are unavailable, but adjust baking time accordingly.
- Use gel food coloring for a more vibrant green without thinning the frosting.
- These brownies can be prepared a day ahead and stored in an airtight container at room temperature for freshness.
- For a dairy-free version, substitute the butter with a vegan butter alternative and use a dairy-free brownie mix.

