01 - Melt chopped chocolate and coconut oil, if using, in a microwave-safe bowl in 30-second bursts, stirring between intervals until the texture is smooth and fluid.
02 - With a pastry brush or spoon, coat the interior of silicone half-sphere molds with a thin, even layer of melted chocolate. Refrigerate molds for 10 minutes until set.
03 - Apply a second layer of chocolate for durability and refrigerate for an additional 10 minutes or until fully solidified.
04 - Carefully remove the set chocolate shells from the molds and set aside.
05 - In a small mixing bowl, combine hot cocoa mix, finely crushed freeze-dried cherries, powdered sugar, and optional vanilla powder, stirring until homogeneous.
06 - Spoon 1 tablespoon of cherry cocoa mix into half of the chocolate shells. Add several mini marshmallows and a few white chocolate chips as desired.
07 - Warm a plate in the microwave. Gently press rim of each empty shell against the warm plate to slightly melt the edge. Promptly join it with a filled shell, pressing lightly to create a smooth seam.
08 - Tint melted white chocolate with red or pink food coloring. Drizzle decoratively over the hot chocolate bombs. Add sprinkles or edible glitter as desired. Allow to set completely.
09 - Place a chocolate bomb into a mug. Pour 8 to 10 fluid ounces (240–300 ml) of hot milk over the bomb and stir until fully dissolved and marshmallows float.