To prepare a tunasaurus crunch casserole casseroles recipe, first you need to prepare the ingredients for the casserole. First, you'll need 2 cups shredded cheddar cheese, 2 tablespoons mayonnaise, 1 tablespoon ketchup, and 2 teaspoons Worcestershire sauce. Then you will need 1 cup diced tomatoes, 1/2 cup chopped red bell pepper, 1/4 teaspoon thyme and 1 teaspoon garlic powder. You will also need 4 ounces chopped scallions. Next, add 1 1/2 cups chopped green peppers. Finally, pour the mixture into the prepared casserole dish and bake for 20 to 25 minutes or until the cheese is melted and the topping is bubbly.