Steps
1. Heat up the olive oil in a skillet over medium heat.
2. Add the onion, garlic, peppers and cook until the vegetables are tender, about 5 minutes.
3. Add the diced tomatoes and simmer for an additional 5 minutes.
4. Place the cod filet in the skillet and cook for 8 minutes, flipping once during the process.
5. Remove the skillet from the heat and season with salt and pepper.
6. Serve hot.