Add the butter to a large skillet set over medium high heat. Stir in the onions, peppers, and celery. Saute, stirring often, until the vegetables have softened.
1 tbsp salted butter, 1 cup diced yellow onion, ½ cup diced green bell pepper, ½ cup diced celery
Stir in the garlic and saute for another 60 seconds. Remove the skillet from heat and set it aside.
4 cloves garlic
To a large mixing bowl add the rice, shrimp, soup, broth, mayonnaise, and sauteed vegetables. Stir everything together until evenly combined. Season with salt and pepper, to taste.
3 cups steamed white rice, 1 lb cooked shrimp, 1 10.5 oz can condensed cream of mushroom soup, 1 cup chicken broth, ¾ cup mayonnaise, salt and pepper
Spray a 9x13" baking dish with nonstick cooking spray. Transfer the shrimp and rice mixture to the baking dish and spread it out in an even layer. Sprinkle the shredded cheese evenly out overtop.
½ cup grated cheddar cheese
In another bowl add the cracker crumbs and melted butter. Stir together until evenly combined, then spread out evenly over the casserole.
1 sleeve Ritz crackers, 4 tbsp melted butter
Bake at 350° for 25-30 minutes, just until the casserole's hot and bubbly and the crumb topping is golden brown.
Serve warm and enjoy!