Step 1: In a large bowl, combine the cake crumbs and buttercream frosting until a dough-like consistency forms.
Step 2: Melt your chocolate or candy melts in the microwave in 30-second intervals until smooth.
Step 3: Using a small spoon or clean paintbrush, coat the inside of each popsicle mold with a layer of chocolate.
Step 4: Insert the popsicle sticks into the slots provided in the mold, then pull them out slightly (this keeps the hole open).
Step 5: Place the mold in the freezer for 5 minutes to set the first layer of chocolate.
Step 6: Apply a second thin layer of chocolate to the sides of the mold to ensure strength and freeze for another 5 minutes.
Step 7: Press a small amount of the cake mixture into each mold, leaving a tiny bit of space at the top for the final chocolate seal.
Step 8: Re-insert the popsicle sticks all the way into the cake centers.
Step 9: Spread a layer of melted chocolate over the back of the cake to seal the popsicle completely.
Step 10: Scrape off any excess chocolate and freeze for 15-20 minutes until completely firm before gently popping them out of the silicone molds.