Use Melted Butter: Melted butter distributes more evenly over the dry cake mix than cold butter.
Evenly Distribute Oreos: Make sure the Oreo layer is spread evenly in the pan before adding the cake mix.
Check for Doneness: The cake is done when the topping is golden brown and a toothpick inserted into the cake part comes out with just a few moist crumbs.
Let it Cool: Let the cake cool for a few minutes before serving. This allows it to set slightly and makes it easier to slice.