Melt ⅔ of the candy melts in the microwave for up to 30secs at a time, stirring between bouts until smooth. Add ⅔ of the oil and stir until you have a smooth melted candy.
Spoon the melted candy into the moulds, spreading evenly with a spoon or brush, ensuring you cover the sides up to the edges. Tap your mould on the surface a few times to remove any air bubbles.
Push the popsicle sticks partway into the moulds (about ½ inch / 1-2 cm), then put in the fridge for 5-10mins to set.
Take the moulds from the fridge and fill them with cakesicle mix to just below the edges, pressing in gently to smooth the top.
Push the popsicle sticks in until they sit roughly ⅔ of the way into the mould, pressing the cakesicle mix down if needed. Put the moulds back in the fridge.
Melt the remaining ⅓ of your candy melts (30 secs at a time, stirring between rounds), then stir in the final ⅓ of oil mixing until smooth.
Remove the moulds from the fridge and spoon the candy melts over them, covering the cakesicle mix completely. Place back into the fridge for 5-10mins, then carefully pop each cakesicle out of the mould.