Step 1: In a large bowl, combine the crumbled cake and frosting. Mix until it reaches a dough-like consistency that holds its shape when pressed.
Step 2: Melt the chocolate or candy melts in the microwave in 30-second bursts, stirring in between until completely smooth. Stir in coconut oil if a thinner consistency is desired.
Step 3: Place 1 tablespoon of chocolate into each cavity of the silicone mold. Spread evenly up the sides using a spoon or brush. Insert the sticks briefly to ensure the opening stays clear, then remove the sticks.
Step 4: Freeze the mold for 5 minutes. Apply a second thin layer of chocolate to the sides if needed and freeze for another 5 minutes until set.
Step 5: Press the cake mixture firmly into each cavity, leaving a small space at the top. Re-insert the popsicle sticks into the cake centers.
Step 6: Pour melted chocolate over the cake filling to seal the back. Use a spatula to scrape off any excess chocolate for a flat finish.
Step 7: Freeze for 20 minutes. Gently peel the mold away from the popsicles and decorate as desired.