To prepare a polynesian yam casserole casseroles recipe, first you need to prepare the ingredients for the casserole. First, you'll need the following ingredients: 1 pound (240 g) YUMMY Casserole Mix 1 cup (120 ml) chopped scallions 1/2 cup chopped green onions 1 teaspoon salt 1 tablespoon ground black pepper 2 tablespoons butter 2 tbsp. olive oil 2 cups diced red bell peppers 2 teaspoons dried oregano 1/8 teaspoon ground paprika 14 teaspoon kosher salt 1/2 teaspoon pepper 1 1/2 cups shredded cheddar cheese 1 1/4 cup grated parmesan cheese 1/2 c. butter or margarine Instructions: Preheat the oven to 350 degrees F. Peel and slice the sweet potato and cut it into 1/4-inch cubes. Toss them with the butter, salt, and pepper. Bake for 20 minutes or until tender. Remove the potatoes and add them to the mashed potatoes. Pour the cream of mushroom soup over the top and mix it all together. Add the cheese and bake for an additional 5-10 minutes. Serve warm or at room temperature.