Hot Cocoa Bombs
Chocolate spheres filled with cocoa and marshmallows that melt open in hot milk.
Updated: Nov 9, 2026
Why you'll like it
- Ready in about 1 hr.
- Serves 12 — easy to halve or double.
- Medium level — everyday equipment only.
- Storage, freezing and reheating covered below.
This Hot Cocoa Bombs recipe takes 1 hour and makes 12 bombs. Cocoa bombs are hollow chocolate spheres stuffed with cocoa mix and mini marshmallows that burst open when hot milk pours over, which makes them the most giftable Christmas treat for kids.
Helpful guides
Instructions
Melt 16 ounces chocolate with coconut oil in 20-second bursts until fluid. Spoon 1 tablespoon into each cavity of a silicone half-sphere mold and brush fully up the sides. Chill 10 minutes, then add a second thin coat and chill again until hard.
Carefully pop shells from the mold. Warm a plate in the microwave, press each open edge 3 seconds to melt slightly, giving a flat rim that seals.
Fill half the spheres with 1 tablespoon cocoa powder, 1 tablespoon powdered sugar, a pinch of salt, and a small handful of marshmallows. Overfilling prevents sealing.
Press a hollow half onto each filled half with the warmed rims, hold 10 seconds, and smooth the seam with a fingertip. Chill 10 minutes to lock the seal.
Melt remaining 8 ounces chocolate, drizzle over sealed bombs with a spoon, and add sprinkles before it sets. Rest until firm.
To serve, place one bomb in a mug and pour 12 ounces steaming milk over it. Wait 30 seconds, then stir until the marshmallows float up.
Troubleshooting — fixes, not repeats
- If shells crack, coats were too thin; two full coats with chilled setting between is the rule.
- If halves will not seal, rims cooled before joining; rewarm the plate and work in pairs.
- If chocolate blooms white, it got damp or warm; store cool and dry and it stays glossy.
- If bombs melt in your hands, chill finished pieces 10 minutes before decorating.
Make it your way
- For peppermint bombs, add crushed candy cane to the filling and drizzle with white chocolate.
- For mocha bombs, add 1 teaspoon instant espresso to each cocoa portion.
- For gifting, nest each bomb in a cupcake liner inside a mug with cocoa instructions because the presentation sells itself.
Storage & reheating
Cool leftovers within 2 hours, then refrigerate in a covered container and use within 3 to 4 days. Reheat only the portion you will eat until steaming hot throughout — poultry and reheated rice should reach 165°F (74°C).
FAQ
What mold works best?
Silicone half-sphere molds around 2.5 inches release easiest and give the classic size. Rigid plastic molds crack shells. Start with the suggested amount, then adjust to suit your taste and equipment.
Can I use candy melts?
Yes, melts set firmly without tempering and come in holiday colors. Real chocolate tastes richer. Start with the suggested amount, then adjust to suit your taste and equipment.
Why did mine collapse in milk?
The milk was not hot enough or shells were too thick. Use steaming milk and thin even coats. Start with the suggested amount, then adjust to suit your taste and equipment.