Line a 9x13" baking pan with foil and spray with nonstick spray.

In a very large bowl, combine the cereal and oreos. Set aside.

In a large saucepan over medium heat, add the butter and melt completely. Add the 8 cups marshmallows, salt and vanilla. Stir until all marshmallows are completely melted.

Pour over the cereal and stir to combine.

Add the remaining 2 cups marshmallows and sprinkles. Dump into the prepared pan and top with remaining oreos and sprinkles. Allow to cool or eat them warm. Wrap tightly with saran wrap to store.