Preparation Steps

• Polish a 6-cavity silicone half-sphere mold with a paper towel for shine. Have 2 small piping bags (or zip-top bags) ready and a small nonstick skillet you can warm later for sealing.
• Melt candy melts and wafers in microwave-safe bowls at 50% power in 15–20 second bursts, stirring well between each round until smooth. Avoid overheating.
• Make the pupils: Melt the black candy melts, transfer to a piping bag, and pipe a nickel-size dot in the very center of each mold cavity. Freeze 4 minutes to set.
• Add the irises: Melt green and purple melts in separate bowls. Pipe a 1-inch ring over and around each black pupil, alternating colors as desired. Freeze 4 minutes until firm.
• Create veins: Melt the red candy melts and snip a very fine tip on the bag. Drizzle thin, squiggly lines up the sides of each cavity for a bloodshot look. Freeze 4 minutes.
• First white coat: Melt about two-thirds of the white wafers. Spoon a little into each cavity and swirl/brush it up the sides to form a thin shell. Patch any see-through spots. Refrigerate 8 minutes.
• Second coat: Melt the remaining white wafers. Add a second layer, focusing on reinforcing the rims. Refrigerate 6 minutes until completely set, then carefully unmold the shells.
• Prep the filling: In a small bowl, whisk the hot cocoa mix with the vanilla powder (if using). Warm a clean, dry nonstick skillet over low heat for about 1 minute, then turn heat off; residual warmth will seal the shells without melting them.
• Fill and seal: Lightly press the rim of one shell onto the warm skillet for 1–2 seconds to level. Add 1 tablespoon cocoa mix and a few mini marshmallows. Warm the rim of a second shell briefly and cap the first, holding 8–10 seconds to seal. Repeat for all bombs; dab on a touch of melted white chocolate if any seams need patching.
• Set the bombs: Chill assembled bombs 8–10 minutes in the refrigerator, or let sit at room temperature for 15 minutes to fully firm up.
• Serve: Place one bomb in a mug and pour 8–10 oz very hot milk over the top. Stir as the shell opens and enjoy. Optional: finish with whipped cream.