Hot Cocoa Bomb Recipe: How to Make Them at Home

Before any chocolate goes near it, push one cavity of the mold inside out with your thumbs. It should flip without fighting you. That flex is the whole reason a cheap floppy mold beats a heavy one. You peel the silicone off the set chocolate instead of shoving the dome out and snapping it.

Look for cavities 2.5 to 2.75 inches across. Six cavities give you six halves, which is three finished bombs. Rigid silicone holds its shape when you press on it, and the shell cracks along the rim every time.

Tip 8 ounces of melting wafers into a silicone or microwave-safe plastic bowl. Heat for 30 seconds, pull it out, and stir the whole bowl with a spatula before it goes back in. Repeat until the last lumps disappear. Eight ounces takes about a minute in total.

Stirring between every burst is doing real work. It moves heat out of the hot spots and into the unmelted wafers so the batch comes to one temperature instead of scorching at the bottom. Skip the glass bowl. Glass holds heat and keeps cooking the chocolate after it leaves the microwave.

Drop about two tablespoons of melted chocolate into each cavity. Use the back of a small spoon to push it up and around the curve. The bowl of the spoon matches the shape of the dome, so it spreads the chocolate without dragging it thin.

Coat the whole inside surface of all six before you go back for a second pass. You can also lift the mold and tilt it so the chocolate runs around the walls on its own. The silicone is cooler than the chocolate, so every pass leaves another film behind and the coating creeps thicker.

Go back over every cavity with a small pastry brush, pulling chocolate from the pooled bottom up onto the sides. A brush is gentler than a spoon, which can scrape a stripe right down to bare silicone. Keep working until no light shows through the walls.

This step decides whether the bombs survive. The mold sits right side up while it sets, so the chocolate sags to the bottom and the sides finish thin. Thin sides crack the moment you press two halves together, and a cracked half spills cocoa mix across the counter.

Turn the mold over and let the extra chocolate fall onto a silicone mat. Run an offset spatula flat across the top to shave the rims clean. Neat rims let two halves sit flush later. Then into the fridge for 5 to 10 minutes, until the shells are firm to the touch.

To release them, bend the silicone away from the chocolate rather than pressing on the dome. Once an edge is exposed, peel the rest back like a glove. Set each half flat side down. The chocolate you dumped out sets hard and scrapes up for the next batch.

Spoon about a tablespoon of hot cocoa mix into half of your shells and leave the rest empty, since those become the lids. Any mix works. The one in the video is sugar and cocoa powder, which you can stir together yourself rather than buying a tin.

Add mini marshmallows on top of the powder. The whole point is the moment everything floats up out of the melting shell, so be generous with them. Keep the filling below the rim, though, so nothing sits in the way of the seal.

Set a nonstick pan on the burner for around 10 seconds, then take it off the heat. Barely warm is enough, because chocolate needs very little to melt. Press an empty shell rim-down on the pan for a few seconds, until the edge turns wet and glossy.

Lift it straight up and lower it onto a filled half, lining the rims up as you go. The melted chocolate sets within seconds and welds the two into one sphere. Pressing down or twisting cracks it, so place it and let go.

Hold a finished sphere over the bowl of leftover chocolate and flick a spoonful across the top, letting the excess drip back into the bowl. While the drizzle is still wet, scatter dehydrated marshmallow bits over it so they stick. Whatever goes on top should hint at what is waiting inside.

Sit each one in a cupcake liner. They fit the 2.5 inch dome closely and keep fingers off the chocolate when you hand them out. To use one, stand it in a mug and pour steaming milk over the top.