Flip the cake out onto a work surface on another piece of parchment paper
Split your cake using a blade cake leveler, knife or my favorite method- dragging a piece of dental floss through the cake lengthwise
Separate the layers by sliding another piece of parchment paper in-between the layers you created and then lifting the top layer off
Spread on your jam in a thin, even layer
Top jam with a thin layer of frosting
Carefully place top layer back on - you now have a cake sandwich
Cover and place in the freezer for several hours, you want it to be quite firm
Once frozen, cut into squares
Place on a wire rack over a baking sheet to catch the extra frosting
Place several scoops of frosting in a small bowl and heat in microwave for about 30 seconds or until the frosting has liquefied
Spoon frosting over frozen cake pieces until fully coated
Add sprinkles
Refrigerate until ready to serve