Using a medium sized bowl, mix together all of the ingredients and let sit while the fish is in the oven.
For the fish:
Preheat your oven to 400 degrees. Lightly spray or grease a 13 x 9 casserole dish and lay the cod inside, in a single layer. Drizzle with the olive oil, and season with salt and pepper.
Bake for about 12 to 15 minutes, or until the cod just begins to flake easily with a fork. Be careful not to overcook. Remove from the oven and onto a serving platter. Top with the olive and tomato topping and serve immediately.