Line a 9x13 inch pan with parchment paper for easy removal.
In a large saucepan, melt the butter over low heat until it’s just melted and begins to shimmer softly.
Add the marshmallows to the melted butter and stir constantly until the marshmallows are completely melted and the mixture is smooth and gooey with a slight bubbling sound.
Stir in the pumpkin puree and pumpkin pie spice, mixing well until fully incorporated and the mixture develops an orange hue and fragrant aroma.
Remove the saucepan from heat, then add a few drops of orange food coloring and stir until the mixture turns a vibrant orange, adjusting the color to your preferred brightness.
Add the rice cereal to the saucepan, folding gently with a spatula until each piece is coated with the pumpkin marshmallow mixture.
Immediately pour the mixture into the prepared pan and press down firmly with a spatula or greased hands to an even layer, ensuring all corners are filled.
Let the treats cool at room temperature for about 20–30 minutes until set and firm.
Once cooled and firm, cut into squares or Halloween-themed shapes to serve.
Enjoy these colorful, festive Pumpkin Rice Krispie Treats as a fun Halloween snack that combines crunch and gooey marshmallow goodness.
