Line your baking dish with parchment paper for easy removal later.
Melt the butter in a large saucepan over medium heat, listening for a gentle bubbling and a buttery aroma as it melts smoothly.
Add the marshmallows to the melted butter, stirring continuously until they’re completely melted and the mixture is glossy and smooth.
Stir in the pumpkin puree, blending thoroughly until the mixture is uniform and fragrant with warm cinnamon and spices.
Add the ground cinnamon, nutmeg, cloves, and vanilla extract, stirring to incorporate the spices evenly into the mixture.
Remove the saucepan from heat and pour the cereal into the pumpkin-spiced marshmallow mixture, gently folding with a wooden spoon until all the cereal is coated and sticky.
Transfer the mixture into the prepared baking dish, pressing it down evenly with a spatula or your hands to create a compact layer.
Allow the treats to set at room temperature for about 15-20 minutes until firm and slightly sticky to the touch.
Once set, cut into squares or your desired shapes using a sharp knife for clean edges.
Arrange your Pumpkin Spice Rice Krispie Treats on a serving platter for festive presentation.
Enjoy these chewy, crunchy treats full of warm pumpkin and spice flavors at your Halloween celebration.
