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Once all of the molds have set, place a microwave safe plate in the microwave and heat until warm, about 30 seconds.
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Take one of the red domes and place it on the warm plate, flat, open side down. Carefully rotate the dome on the plate so that the chocolate melts a little bit. This will help it stick to the dark cocoa dome. Place the red dome, dome side down, on a piece of wax paper. Place two tablespoons of hot cocoa mix and a sprinkle of mini marshmallows inside the red dome.
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Take a dark cocoa dome and place it on the warm plate, flat, open side down. Carefully rotate the dome on the plate so that the chocolate melts a little bit. Gently press the dark cocoa dome on top of the red dome.
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Repeat with remaining domes until all 6 hot cocoa bombs are assembled. Rinse and re-warm the plate as needed.
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To add the ears, take one of the chocolate rounds and gently rub one edge on the warm plate so that it melts into the shape of a Mickey ear.
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Gently press the ear, flat side down, onto the top of the hot cocoa bombs. Repeat until all cocoa bombs have 2 Mickey ears. Let rest.