1Coat an 8-inch round pan with cooking spray. Set it aside.
2Add the butter to a medium saucepan set over medium heat. Once the butter has melted, add the marshmallows and cook, stirring constantly, until the marshmallows are melted. Stir in the vanilla extract and then the Rice Krispies cereal until the cereal is well coated.
3Transfer the mixture into the prepared cake pan and press it firmly against the inside edge of the pan to form about a 1-inch crust. Let it cool while you prepare the filing.
1Add the butter and pumpkin pie spice to a medium saucepan set over medium-low heat. Once the mixture has melted add the marshmallows and cook, stirring constantly, until the marshmallows are melted. Stir in the orange food coloring then stir in the Rice Krispies cereal until the cereal is well coated.
2Press the mixture firmly inside the crust border, pushing it down to compact it, and allow it to cool completely in the pan. Once cooled, place a serving plate on top of the pan and invert the pan.
3In a microwaveable bowl, microwave white melting chocolates for 30 second intervals until smooth.
4Slice the pie into wedges and drizzle with melted white chocolate.