Stir chicken, the "something crunchy," "something oniony," and mayonnaise or yogurt together until evenly coated. Season with salt and pepper, to taste. (This can be made the night before, and refrigerated.)
Evenly fill the hot dog buns with the salad mix. Wrap in parchment or butcher paper. Pack in a lunch sack with an ice pack and send off to school.
Roasted turkey is great in these as well. Or, for adventurous eaters, make it curried: Stir 2 teaspoons curry powder, 1/3 cup chopped fresh cilantro and 1/4 cup golden raisins into the mix.
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