Joe,
You are close but I think the real recipe is this:
#1 Preheat oven to 350 degrees F (175 degrees C).
#2 Grease slabs (BVG. PSA, SGC)
#3 In a medium bowl, stir slabs together until smooth.
#4 Beat them one at a time, then stir in the penny plastics and top loaders.
#5 Place slabs 2 inches apart onto the prepared tin sheets. Place top loads and penny plastics aside for later.
#6 Bake for 8 to 10 minutes in the preheated oven. Allow slabs to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.
Check for damage.
Love your recipe though but this one is a family holiday fave so just wanted to share it!
peace, mike