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Line a 9×13-inch baking pan with foil and spray with cooking spray. Set aside.
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Melt the butter and the marshmallows in a medium sized saucepan over medium-low heat. Once the marshmallows are melted, remove from heat and stir in the vanilla. Quickly stir in the cereal. Stir in the candy and sprinkles.
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Pour the marshmallow-cereal mixture into the prepared baking dish. Press to flatten. (I like to spray my hands with cooking spray and use them to press the treats into the pan – just be careful not to burn yourself.) Cool completely before cutting into squares.
Anyone can make my extra thick Rice Krispie Treats for Halloween! Add Halloween candy, candy corn and sprinkles into the my original rice crispy treat recipe for the best cereal treats!