Using a spoon, put 1 tablespoonful of chocolate into one 1 ½ x 2 ½ inch popsicle mold at a time (if you are using the 2x3 inch larger molds, use 1 ½-2 tablespoons instead)
Smooth the chocolate into a thin layer all around the mold making sure to coat the bottom and go up the sides, repeat with all of your popsicle cavities
Slide a popsicle stick in to place in all the molds and add a bit extra chocolate around each to secure them
Place the mold into the refrigerator to chill for 5 minutes until the chocolate shell hardens
Gently press 1 tablespoonful of the cake filling in the hard chocolate coated molds (smaller) leaving a small space at the top for the additional chocolate layer, repeat with all of your popsicle cavities (for 2x3 larger molds, use 1 ½-2 tablespoons of cake filling)
Spoon a teaspoon of chocolate for 1 ½ x 2 ½ molds and 1 ½ teaspoon for the 2x3 larger molds over top and spread it to cover all cake, repeat with all of your popsicle cavities
Use an offset spatula or scraper, remove any extra chocolate making it a flat line level with the mold
Chill for 5 minutes in the refrigerator until the chocolate layer hardens then unmold the cakesicles by gently pulling back the mold from the chocolate and sliding out the popsicle stick from the mold
Decorate the molds with more melted chocolate in different colors and top with sprinkles right after, or use frosting to stick edible gems on them