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Preheat oven to 375 degrees. Brush baking sheet with olive oil. Place snapper fillets, skin side down, on work surface; season with salt and pepper; spread each with 1/2 tablespoon Dijon mustard.
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Place herbs on plate; balance strong herbs, such as dill and thyme, with milder ones, such as parsley. Press mustard-coated side of fillets in herbs to coat evenly.
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Bake fish on baking sheet, skin side down, until opaque throughout, 12 to 15 minutes. Serve with couscous.