Cut each banana in half lengthwise, then cut each half in half again to make four quarters per banana.
Insert popsicle sticks into the cut end of each banana quarter. Place on a wax paper-lined baking sheet and freeze until solid.
Once bananas are frozen, place the semi-sweet chocolate and canola oil (if using) in a microwave-safe mug or bowl.
Microwave in 30-second intervals, stirring well after each interval, until the chocolate is fully melted and smooth.
Dip each frozen banana quarter into the melted chocolate, allowing excess chocolate to drip off. Place back on the wax paper-lined baking sheet.
Quickly add sprinkles or other toppings to the chocolate-covered side before the chocolate hardens.
Return the baking sheet to the freezer until the chocolate is firm and the treats are ready to eat.
Enjoy your frozen banana treats!
Notes
Adding a small amount of oil to the chocolate can help thin it, making it easier to coat the bananas. You might have some leftover chocolate, which can be used for other treats like chocolate-covered strawberries.