Here in Casablanca, November 17th has brought a lovely, cool, crisp evening. It's the kind of weather that makes me nostalgic for my cozy kitchen in Austin, Texas, and all my favorite Thanksgiving and Christmas traditions. My absolute favorite new-ish tradition is making these Hot Chocolate Bombs. They are the most fun, festive, and impressive-looking treat, and they're secretly so easy to make! They're a perfect holiday activity to do with kids, and they make the most amazing homemade gifts for friends and family.
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My non-negotiable tip: You must make sure the chocolate shell is thick enough, especially around the rim. On my first test, the edges were too thin, and they cracked and broke when I tried to pop them out of the silicone mold. A nice, thick, even layer is the secret to a perfect sphere.
The Perfect, Viral Holiday Treat
This is the ultimate cozy-weather treat. A Hot Chocolate Bomb is a hollow sphere of hardened chocolate, filled with dry hot chocolate mix and mini-marshmallows. When you're ready, you place the "bomb" in a mug, and as you pour hot, steaming milk over it, the chocolate shell dramatically melts, bursts open, and releases all the goodies inside! A quick stir, and you have the richest, creamiest, most decadent cup of hot cocoa.
Why You'll Love This Recipe
- Incredibly Fun to Make & Give: This is a perfect, easy, homemade holiday gift for teachers, neighbors, and friends.
- The "Wow" Factor: The "reveal" when the hot milk hits the bomb and the marshmallows pop to the top is so fun to watch.
- Completely Customizable: You can fill them with any of your favorite hot cocoa additions-sprinkles, toffee bits, or different flavored chips!
- Easy to Make: While they look professional, they just require a silicone sphere mold and some simple chocolate melting.
Ingredients
Here's what you'll need for this fun, viral treat. For the full list with precise measurements, see the recipe card at the end of the post!
- Chocolate: 2 cups of semi-sweet chocolate chips or a high-quality baking bar (like Ghirardelli or Guittard).
- Oil: Coconut oil or vegetable oil. This is the secret! It helps thin the chocolate slightly, making it easier to spread in the molds and giving it a shinier finish.
- Hot Chocolate Mix:
- Dry Milk Powder
- Powdered Sugar
- Unsweetened Cocoa Powder
- Fillings: Mini marshmallows.
- Decoration: White chocolate chips (or any other kind) for drizzling, and holiday sprinkles.
- For Serving: Hot milk (any kind works!).
How to Make Hot Chocolate Bombs
This is a simple "melt, mold, fill, and seal" process.
Step 1: Melt the Chocolate
In a medium, microwave-safe bowl, I add the 2 cups of chocolate chips and the 2 teaspoons of coconut oil. I microwave them in 30-second bursts, stirring very well after each burst. I stop as soon as it's almost melted-the residual heat and final stir will melt the last few chips. This prevents the chocolate from scorching.
Step 2: Create the Chocolate Shells
I use 2.5-inch silicone sphere molds for this. I add a couple of tablespoons of the melted chocolate into each of the 12 half-sphere molds.
Using the back of a small spoon, I spread the chocolate all around the sides and bottom. I make sure to create a nice, thick layer, especially around the top edge or rim. I check to make sure there are no thin spots (hold it up to the light!).
I place the mold into the freezer and chill until the chocolate is completely solid, at least 30 minutes.
Step 3: Make the Hot Chocolate Mix
While the shells are chilling, I make the filling. In a small bowl, I just whisk together the dry milk powder, powdered sugar, and unsweetened cocoa powder.
Step 4: Fill and Seal the Bombs
I carefully remove the 12 frozen chocolate half-shells from the molds. I fill 6 of the shells (the "bottoms") with about 2 tablespoons of the hot chocolate mixture and a few mini-marshmallows.
Now, for the sealing: I place a small, microwave-safe plate in the microwave and heat it for 15-20 seconds. It should be just warm to the touch.
Working one at a time, I take one of the empty half-shells and place its flat edge down on the warm plate for just 1-2 seconds. This instantly melts the rim. I immediately place this melted-edge shell on top of a filled shell to seal them together into a sphere.
Step 5: Decorate and Serve
To make them extra pretty, I melt the white chocolate chips and drizzle this over the tops of the finished bombs, then add sprinkles.
To serve, I heat 1 cup of milk until it's steaming. I carefully drop one Hot Chocolate Bomb into the mug and pour the hot milk over it. I watch it "explode" and release the marshmallows, then stir it all together!
Common Mistakes to Avoid
- Overheating the Chocolate: If you microwave your chocolate for too long without stirring, it will "seize" and become a lumpy, unusable, grainy mess. Low and slow, in 30-second bursts, is the only way.
- Thin Shells: If your chocolate layer is too thin (especially at the edges), the shells will crack and break when you try to remove them from the mold.
- Using a Cold Plate to Seal: The "hot plate" trick is the easiest way to get a clean, perfect seam. Trying to "glue" them together with extra melted chocolate is much messier.
Tips and Tricks for Success
- Use Silicone Molds: You must use 2.5-inch flexible silicone sphere molds for this. Hard plastic molds will not work, as you'll never get the delicate shells out.
- The Coconut Oil Trick: Don't skip the coconut or vegetable oil! It slightly thins the chocolate, making it much easier to spread up the sides of the mold and creates a glossier finish.
- Wear Gloves (Optional): When handling the chocolate shells, your fingerprints will melt them! I like to wear food-safe gloves to keep them clean and neat.
- Cover the Seam: If your seam isn't perfect, don't worry! This is what the drizzle is for. A generous chocolate drizzle and a bunch of sprinkles will hide any imperfections.
Variations
This is where you can get so creative!
- Peppermint: Add ¼ teaspoon of peppermint extract to your melted chocolate and fill with crushed candy canes.
- S'mores: Fill with hot cocoa mix, marshmallows, and a teaspoon of graham cracker crumbs.
- Salted Caramel: Fill with hot cocoa mix and a few caramel bits. Drizzle with caramel sauce and sprinkle with flaky sea salt.
- Mocha: Add 1 teaspoon of instant espresso powder to the hot chocolate mix.
How to Serve
These are the perfect festive treat.
- They are the ultimate homemade Christmas gift. I love to pack one or two in a festive cellophane bag with a ribbon and a tag that says "Pour 1 cup hot milk over me!"
- They are a perfect, cozy treat for a Thanksgiving or Christmas morning.
- A "Hot Chocolate Bomb Bar" is a fantastic idea for a holiday party!
Make Ahead and Storage
- Make Ahead: These are the perfect make-ahead gift!
- Storage: Store the finished (and fully set) hot chocolate bombs in an airtight container at a cool room temperature (like a pantry) for up to 2 weeks. Do not store them in the refrigerator, as the moisture can cause the chocolate to "bloom" (get a white, powdery coating).
Recipe Notes / What I Learned
This recipe is all about the "wow" factor. The first time I made them, I was shocked at how easy they were for how impressive they look. The most important lesson I learned was to be generous with the chocolate in the molds. A thin, delicate shell is a broken shell. A nice, sturdy chocolate shell is what makes for a perfect, satisfying "bomb."
Nutrition Snapshot
Estimated Nutrition Per Bomb (⅙th of recipe): ~390 calories · 6g protein · 52g carbs · 19g fat (This is an approximation and can vary based on the specific chocolate and mix-ins used.)
Hot Chocolate Bombs
Equipment
- Medium microwave safe bowl
- 2.5" silicone sphere molds
- Spoon
- Small bowl
- Small microwave safe plate
Ingredients
Group: Chocolate Shells & Drizzle
- 2 cups chocolate chips
- 2 tsp. coconut or vegetable oil
- ⅓ cup white chocolate chips or other assorted chocolate for drizzling
- Sprinkles, for decorating
Group: Hot Chocolate Filling
- ⅓ cup dry milk powder
- ⅓ cup powdered sugar
- ¼ cup unsweetened cocoa powder
- Mini marshmallows
Group: For Serving
- 6 cups milk, any kind
Instructions
- In a medium microwave safe bowl, add chocolate and oil to bowl. Microwave in 30 second bursts, stirring after each burst until completely melted.
- Using 2.5" silicone sphere molds, add a couple of tablespoons of melted chocolate to bottom of 12 molds. Use a spoon to spread the chocolate all around the sides and bottom in a smooth layer, making sure there are no thin spots. Place into freezer and chill until solid, at least 30 minutes. You may not use all of the melted chocolate, but reserve to help seal the molds together later or for drizzling on top.
- Meanwhile, make hot chocolate mix: In a small bowl combine milk powder, powdered sugar, and cocoa powder.
- Carefully remove frozen chocolate from molds. Fill half of the molds (6 shells) with about 2 tablespoons of hot chocolate mixture and a few marshmallows.
- Place a small microwave safe plate in the microwave and heat for about 15 seconds. It doesn't need to be hot, just warm to the touch. Working just one at a time, place one of the unfilled shells down on warm plate to melt the edge slightly. Place on top of a filled shell to seal together. Use extra melted chocolate to fill in any gaps or holes around the edges. You can also do a layer all around the seam and roll in sprinkles to cover. Repeat with remaining molds.
- In a small microwave safe bowl add chocolate chips and melt in 30 second intervals, stirring after each one until melted. Drizzle tops of hot chocolate bombs and top with sprinkles, if desired.
- For each hot chocolate bomb, heat 1 cup of milk and pour into a mug. Carefully drop a hot chocolate bomb into hot milk. Let the chocolate melt and release the mix inside and stir to combine.
Notes
Nutrition
FAQs
Do I have to use a silicone mold?
Yes. For this recipe, a silicone sphere mold (usually 2.5 inches) is essential. You cannot get the chocolate out of a hard plastic mold without breaking it.
Can I use chocolate bars instead of chocolate chips?
Yes! In fact, a high-quality chopped chocolate bar (like Ghirardelli or Guittard baking bars) will often melt much more smoothly and easily than chocolate chips, which contain stabilizers to help them keep their shape.
My chocolate shell is cracking! Why?
It's almost certainly too thin. You need to use a spoon to really push the melted chocolate up the sides of the mold, creating a thick, sturdy "lip" or "rim."
