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Pistachio Cornflake Crunch Bars

These Pistachio Cornflake Crunch Bars combine gooey marshmallows, buttery pistachio flavor, crisp cornflakes, and a snappy layer of dark chocolate for a treat that’s sweet, salty, nutty, and addictive. Ready in under an hour and perfect for dessert nights, snacks, or gifting.
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Course: Dessert
Cuisine: American
Keyword: chocolate topped cornflake bars, chocolate topped cornflakes, cornflake bars, cornflake squares, crunchy pistachio cornflake bars, pistachio cornflake crunch squares, pistachio cornflake treats, pistachio crunch bars, pistachio marchmallow bars
Prep Time: 15 minutes
Chill Time: 30 minutes
Total Time: 45 minutes
Servings: 24 pieces

Ingredients

  • 1 bag 10–12 oz marshmallows
  • 4 tablespoons unsalted butter
  • ½ cup creamy pistachio butter
  • Pinch of salt
  • 1 teaspoon vanilla extract
  • 6 cups cornflakes cereal
  • 16 oz dark chocolate 70–72% cacao preferred
  • 2 tablespoons coconut oil
  • Flaky sea salt for topping

Instructions

  • Line a 9×13-inch pan with parchment paper, leaving overhang for easy removal.
  • Melt butter in a large saucepan over medium-low heat. Add marshmallows and stir constantly until smooth.
  • Stir in pistachio butter, salt, and vanilla until fully combined.
  • Remove from heat and gently fold in cornflakes until coated.
  • Transfer mixture to prepared pan and gently press into an even layer without packing too tightly.
  • Melt dark chocolate with coconut oil until smooth. Pour over bars and spread evenly.
  • Sprinkle generously with flaky sea salt while chocolate is still wet.
  • Refrigerate 30–45 minutes until set. Lift from pan, slice, and serve.