How to make the shells:
Melt the chocolate by putting in a microwave-proof bowl and melt for 30 seconds, then stirring for about 30 seconds. Repeat (probably twice) until all is smooth and runny.
Coat the inside of your sphere moulds. Turn them over and tap the base to shuffle the chocolate down the sides.
Turn back over, check for any gaps that have appeared (fill with more chocolate if there are any) and pop into the freezer for about 15 minutes.
Filling the bombs:
Put gloves on if you're using them. Remove the half spheres from the freezer and pop out of the moulds.
Fill half of them with the hot chocolate powder and marshmallows. (Don't overfill or they will be harder to close.)
Warm a dinner plate (either in a hot oven for 2-3 minutes or by running under a very hot tap for a couple of minutes and drying off - don't let water touch chocolate!)
Put the edge of one of the unfilled shells onto the warm plate very briefly. Use a knife to lift it off and sit it on top of one of the filled shells.
Push together in your hands and smooth the edges with your fingers.
Put back into the freezer for 15 minutes.
To use the Hot Chocolate Bombs:
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