- 2 (4 ounce) fillets swai fish
- Salt and ground black pepper to taste
- 1 tablespoon olive oil, or as needed
- 1 onion, chopped
- 1 clove garlic, minced
- 1 (14.5 ounce) can petite diced tomatoes
Preheat oven to 400 degrees F (200 degrees C).
Place swai fish in a glass casserole dish and season with salt and black pepper.
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Heat olive oil in a large skillet over medium heat; cook and stir onion until softened, about 10 minutes. Add garlic and cook until fragrant, about 1 minute. Pour tomatoes over onion mixture; cook and stir until heated through, about 5 minutes. Spoon tomato mixture over fish.
Bake in the preheated oven until fish flakes easily with a fork, about 20 minutes.