INGREDIENTS
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1½ - 1¾ lbs russet potatoes (about 4 medium potatoes)
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2 garlic cloves, minced
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1 onion, thinly sliced
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3 tomatoes, sliced
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4 Tbsp olive oil, plus more to brush the baking dish
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1 - ½ lbs white fish fillets (cod, haddock, swai, tilapia, snapper, sea bass, catfish, etc)
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fresh herbs, such as parsley, basil, dill
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dry herbs, such as basil, thyme,
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Old Bay, optional
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salt, pepper
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4 Tbsp butter
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⅓ - ½ cup milk
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3 egg yolks