Spray a 9 inch cake pan with cooking spray and set aside.

Place the butter in a medium saucepan over medium heat. Once it has melted add the marshmallows and vanilla and cook, stirring frequently, until everything is melted and combined.

Remove from heat and stir in the Rice Krispies.

Spoon the Rice Krispies treats around the edge of the prepared cake pan. Spray your hands with cooking spray and press the treats against the edge to form a 1 inch crust. Allow to cool for 10 minutes.

To make the filling Place the butter in a medium saucepan over medium heat. Once it has melted add the marshmallows and cook, stirring frequently, until they have melted. Stir in the pumpkin pie spice and food coloring and mix well.

Remove from heat and stir in the Rice Krispies.

Spoon the orange Rice Krispies treats into the center of the pan and push it down to fill in the center of the pan. Allow it to cool completely.

To make the topping combine the butter and vanilla in a bowl and mix until smooth. Add in the powdered sugar 1/4 of a cup at a time until desired consistency is reached.

Pipe the frosting onto the pieces to make "whipped cream".

Cut into slices and serve.