Once the cake is completely cooled, add three-quarters of the frosting to the crumbs and mix until just combined. Check the texture—if the mixture holds together when pressed and feels moist, don’t add any more frosting. If it feels too dry, add the remaining frosting and mix again. Be careful not to add too much, as this can make the cake pops too soft.
Scoop tablespoon-sized portions of the mixture, roll into balls (don't worry if they aren't perfect just yet), and place onto a lined tray.
Chill in the freezer for 10 minutes or the fridge for 30 minutes, then roll again to smooth them out.
Return the cake balls to the freezer for a further 30 minutes, or refrigerate for 1 hour 30 minutes, until firm.
Meanwhile, melt the chocolate. Place half of the chocolate into a microwave-safe mug and heat in 20-second bursts, stirring between each, until smooth. Alternatively, melt over a double boiler. Only melt more chocolate as needed (see note 3).
Dip the tip of each cake pop stick into the melted chocolate, then insert it halfway into a cake ball. Repeat with the remaining sticks.
Holding the stick, dip each cake ball into the melted chocolate and swirl to fully coat. Gently tap off any excess, then twirl to smooth the coating. Quickly decorate with sprinkles before the chocolate sets.
Place the cake pops upright in a cup filled with rice, a box with small holes, or styrofoam to set completely.
Repeat with the remaining cake pops, reheating the chocolate as needed to keep it thin and smooth. If the cake balls soften, return them to the fridge or freezer to firm up again.
Allow the cake pops to fully set before serving. Enjoy!