Lightly grease a 9x13 inch pan with butter or line it with parchment paper and set aside

In a large pot on the stove, heat the butter until melted over medium heat

Stir the pumpkin spice into the butter then add in the marshmallows

Stir the marshmallows & butter continuously over medium heat until the marshmallows are fully melted

Remove from heat and mix in the cereal and pumpkin seeds

Smooth the treat mixture into the prepared pan, ensuring an even top layer

Let cool at least 2 hours before cutting into bars

Once cut into bars, warm the white chocolate in the microwave in 30-second increments (~90 seconds total), stirring well between each heating.

Drizzle the white chocolate over the cut bars and let cool before serving