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Combine all of the salsa ingredients. Season well and set aside.
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Heat up a large saute pan with the butter and olive oil and add in the mushrooms, zucchini, onions and garlic. Cook until the vegetables get a bit of color on them, and season well with salt and pepper.
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Top the vegetables with the cod fillets and season with the chili powder, cumin, salt, and pepper.
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Turn your oven to broil and brown the fish for a few minutes until cooked.
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Take out of the oven and top with the avocado salsa. Squeeze extra lime juice in the pan. Enjoy!