Heat butter and olive oil in a large skillet over medium heat. Cook and stir onions and garlic until onions are slightly tender, being careful not to burn garlic.
Add tomato sauce and cherry tomatoes; bring to a simmer. Stir in green olives and marinated vegetables; season with black pepper, cayenne pepper, and paprika.
Add cod fillets to sauce; cook over medium heat until fillets easily flake with a fork, 5 to 8 minutes. Serve immediately.
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