Melt white chocolate chips and coconut oil in a microwave-safe bowl in 30-second intervals, stirring in between, until smooth. Alternatively, melt over a double boiler.
Dip each marshmallow halfway into the melted white chocolate. Let excess drip off.
Place the dipped marshmallows on the prepared baking sheet.
Immediately press a few candy corns into the wet white chocolate of each marshmallow to resemble a pumpkin.
Melt the orange candy melts according to package directions.
Using a toothpick or a small piping bag, draw jack-o'-lantern faces on the marshmallows with the melted orange candy melts.
For extra detail or to draw eyes and mouths, use black food coloring or a black edible marker.
Let the chocolate harden completely before serving.
Notes
Store in an airtight container at room temperature. Enjoy these spooky treats!