Step 1: Grease a 9×9 inch square baking pan or line it with parchment paper for easy removal of your pumpkin spice rice krispies treats recipe.
Step 2: In a large pot over low heat, melt the butter slowly. Once melted, add the mini marshmallows (except for the reserved 1 cup).
Step 3: Stir the marshmallows constantly until they are fully melted and smooth. Remove the pot from the heat immediately to prevent overcooking the pumpkin spice rice krispies treats recipe base.
Step 4: Stir in the pumpkin pie spice, vanilla extract, salt, and orange food coloring until the color and spices are evenly distributed.
Step 5: Gently fold in the rice cereal and the remaining 1 cup of mini marshmallows until the cereal is thoroughly coated by the spiced marshmallow mixture.
Step 6: Transfer the mixture to the prepared pan. Using a greased spatula or parchment paper, lightly press the mixture into the corners. Do not pack it down tightly.
Step 7: Allow the pumpkin spice rice krispies treats recipe to cool at room temperature for at least 30 minutes before cutting into squares and serving.