Melt white chocolate wafers according to package directions. Let cool slightly.
Spoon melted chocolate into a silicone mold, filling each half. Use a spoon or pastry brush to ensure the chocolate coats the entire mold. Refrigerate for 10 minutes until firm.
Carefully remove the chocolate shells from the mold. If needed, gently warm the mold with a heat gun or hair dryer for easier removal.
Fill half of the chocolate shells with eggnog mix, mini marshmallows and nutmeg.
Gently warm a plate. Press the empty chocolate shell against the warm plate to slightly melt the edges. Carefully place the warmed shell on top of a filled shell, sealing them together.
Place bombs in the freezer for 10 minutes. To serve, place a bomb in a mug and pour 8 ounces of hot milk over it. Stir until melted and enjoy!
Notes
Store in an airtight container in a cool, dry place.