Butterfinger Rice Krispie Treats

Bahan-bahan (9 porsi)

• 1 tablespoon salted butter
• ¼ cup creamy peanut butter
• 28 large marshmallows ((or 3½ cups mini marshmallows))
• 4 cups Rice Krispies
• 5.2 ounces chopped Butterfinger candy bars ((see Recipe Notes below))
• ½ cup milk chocolate chips
• 1 teaspoon shortening