Saute Onion In Butter For 7 Minutes. Add Garlic, Tomatoes, Oregano And Chile Paste. Stir And Simmer For 10 Minutes. Season With Salt And Pepper. Pour Mixture Into A Baking Dish. Toss Shrimp With Salt And Pepper And Push Into The Sauce. Bake For 10 Minutes At 375 Degrees. Sprinkle With Parsley And Serve.