Heat the oil in a large skillet over medium heat. Add the onion and garlic and saute until the onion is softened, about 5 minutes. Add the oregano, thyme, salt, and pepper and saute for another 2 minutes.
Add the white wine to the pan and simmer until the liquid is reduced by half, about 5 minutes. Add the tomatoes and simmer for another 5 minutes.
Remove from heat and stir in the cream and Parmesan cheese. Fold in the shrimp, crab, and salmon. Pour the mixture into a 9x13 inch baking dish.
Sprinkle the cracker crumbs over the top of the casserole. Bake in preheated oven until the top is golden brown, about 25 minutes.
Interesting Facts
This casserole is a great way to use up any leftover seafood you may have.
This casserole can also be made ahead of time and reheated before serving.
You can also use other types of seafood in this recipe, such as scallops or clams.