1. 1. Prepare the Pan: Grease a 9×13-inch baking dish or line it with parchment paper for easy removal and clean-up.

2. 2. Melt Butter & Marshmallows: In a large saucepan over low heat, melt the butter. Once melted, add the mini marshmallows and stir constantly until they’re completely melted and smooth.

3. 3. Add Pudding & Vanilla: Remove the pan from the heat and stir in the pistachio pudding mix and vanilla extract until well combined.

4. 4. Mix in Cereal: Gently fold the Rice Krispies cereal into the marshmallow mixture until the cereal is evenly coated.

5. 5. Transfer & Press: Spread the mixture into the prepared baking dish and use a greased spatula or wax paper to press it down evenly.

6. 6. Cool & Cut: Allow the Pistachio Rice Krispie Treats to cool completely at room temperature, which should take about 1-2 hours. Once cooled, cut the treats into squares and serve.