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Step 1: Preheat the Oven
Step 2: Prepare the Shrimp
In a skillet, heat the olive oil or butter over medium heat. Add the chopped onion and garlic, and sauté until they are soft and fragrant, about 3-4 minutes. Add the shrimp to the skillet and cook for 2-3 minutes, just until they start to turn pink. Be careful not to overcook them, as they will continue to cook in the oven. Season with salt and pepper, and set aside.
In a large mixing bowl, combine the cooked rice or pasta, cream of mushroom soup, sour cream, and mayonnaise. Stir until well combined. Add the cooked shrimp mixture to the bowl and fold everything together. At this point, you can add in some of the shredded cheese, reserving the rest for the top.
Step 4: Assemble the Casserole
Step 5: Add the Topping
Step 6: Bake the Casserole
Step 7: Serve and Enjoy
Once the casserole is done, remove it from the oven and let it cool slightly before serving. Garnish with fresh parsley if desired. Serve the casserole warm, alongside a fresh green salad or steamed vegetables for a complete meal.