Begin by rinsing the cod fillets under cold water, then pat them dry using paper towels to ensure they sear nicely. Season both sides generously with salt and pepper.

In a large skillet, heat 2 tablespoons of olive oil over medium-high heat until shimmering. Add the seasoned cod fillets, searing them for about 2 minutes on each side until they turn light golden brown.

Lower the heat to medium and add the minced garlic to the skillet. Sauté for 30–60 seconds until fragrant.

Stir in the canned diced tomatoes along with dried oregano, red pepper flakes, salt, and pepper. Allow the mixture to simmer for about 5 minutes.

Return the seared cod fillets to the skillet, nestling them into the sauce. Cover and cook for an additional 5–7 minutes.

Once cooked, remove from heat and garnish with fresh basil leaves. Serve immediately.