1. Warm 1 Tbsp. oil in a large nonstick skillet over medium-high heat. Pat fish dry and season on both sides with salt and pepper. Cook half of fillets, turning once, until opaque and lightly browned, 4 to 6 minutes total. Transfer to a plate and tent with foil to keep warm. Repeat with 1 Tbsp. oil and remaining fillets.
2. Add remaining 1 Tbsp. oil to skillet. Add garlic and sauté until fragrant, about 30 seconds. Stir in tomatoes, parsley and capers. Cook, stirring, until tomatoes have softened, 3 to 4 minutes. Season with salt and pepper, spoon over fish and serve.