Put a layer of dulce de leche on top and sprinkled rice crispies over it. (Should microwave dulce de leche to make it easier to drizzle in the future. A drizzle might look more aesthetic than the thicker dulce de leche layer with rice crispies sprinkled on top.)
Placed unmelted mini marshmallows into the finished treats for extra chunks/ texture at the very end, plus flaky sea salt. V cute!
Added ~ 1.5 tbsp cinnamon powder to the melted butter and marshmallow mixture, and sprinkled it throughout each layer too (instead of using cinnamon rice crispies)