Melt chocolate in microwave. Cook in 30 second intervals and stir in between, just until melted.

Stir in oil.

Place marshmallows on a silicone, foil or parchment paper lined baking sheet.

Pour melted chocolate over the top of each marshmallow, starting with a tablespoon. Use the back of a spoon and move in a circular motion so chocolate runs down the side. Add more chocolate as necessary.

Place candy eyes wherever you like. For the sunken eye look, add the eyes before the chocolate sets. To have eyes that stay where you place them, let the chocolate harden most of the way. (You can always add melted chocolate to the back of the eyes for them to stick if necessary.)

Let chocolate harden at room temperature.

Store at room temperature in an airtight container.