How to Make It
Preheat oven to 350°F. Whisk egg whites in a large bowl until frothy and almost doubled in size, 1 to 2 minutes. Whisk in sesame seeds, sugar, and salt. Fold in cereal and stir gently to coat.
Using a rubber spatula, spread mixture in a thin layer on a parchment-lined baking sheet. Bake until mixture is golden and dry to the touch, 12 to 14 minutes. Let cool completely on sheet; break into 1-inch pieces.
Toss sesame crunch with cashews, peanuts, pistachios, and raisins in a large bowl.
Store in an airtight container at room temperature for up to 1 month.