I'm no pastry chef, but common sense should tell you to multiply every ingredient by 12, then divide the final product by 12 before cooking them one at a time in the microwave (eugeniekitchen.com)
Once you have a smooth butterscotch sauce (after about 1 - 2 minutes of total microwave time), use a spoon to drizzle the butterscotch sauce over the cream cheese topping. (babaganosh.org)
To reduce microwaving time, you can also thaw them in the fridge the night before. (loveisinmytummy.com)