Mediterranean Cod Packets

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1 pound small Yukon gold potatoes, sliced about inch thick

1 small onion, sliced

1 clove garlic, minced

3 tablespoons extra-virgin olive oil

1/4 teaspoon red pepper flakes

Kosher salt

4 skinless center-cut wild cod fillets (about 6 ounces each)

1/4 teaspoon finely grated lemon zest, plus 2 tablespoons lemon juice

Freshly ground pepper

1 teaspoon chopped fresh thyme

1/4 cup pitted kalamata olives, coarsely chopped

1 15-ounce can cherry tomatoes

2 tablespoons unsalted butter, at room temperature

1 tablespoon chopped fresh chives