Peel ripe bananas and cut them in half. Insert a popsicle stick in the flat side. Lay them on the baking sheet and freeze for at least 4 hours.
When they are frozen melt the chocolate with the oil in a microwave safe dish for 30 seconds. Stir and repeat the 30 seconds and stirring until melted. Or melt in a double boiler.
Roll each banana half in the chocolate and then quickly roll in the sprinkles, nuts or whatever topping you are using.
Freeze until the chocolate sets at least 30 minutes. Serve or freeze in an airtight container for up to a week.