Halibut and Corn Hobo Packs with Herbed Butter

snipped chives

tarragon leaves

unsalted butter, softened

Salt

Freshly ground white pepper

ears of corn, kernels cut from the cobs

large shiitake mushrooms, stemmed and caps thinly sliced

skinless halibut fillets (6 ounces each)

baguette slices, cut on the diagonal