Follow instructions on Marshmallow bag for Rice Krispies Treats. Reserve 10 mini marshmallows for later. Mold the Rice Krispies into balls. Cut the reserved marshmallows in half; add one half to the top of each ball. Secure the marshmallow with two toothpicks.

Stir oil into white chocolate morsels in a glass bowl. Melt chocolate in the microwave on high in 15 second intervals, stirring well after each interval. Continue until chocolate is warm, and completely melted.

Line a baking sheet with parchment paper; place cookie drying rack over cookie sheet. Pour melted chocolate over the top of the Rice Krispies Ornament Treat. Pinch the toothpick ends to lift it up; gently tap-drop the ball a few times over the rack to spread the chocolate. Use a spoon to add more to the base if it isn't completely covered.

Allow to dry completely before removing the toothpicks. Decorate with royal icing if desired.