One easy squash casserole recipe found on Cooks.com combines just four ingredients. The ingredients needed are 6 medium squash, 1 can mushroom soup, thyme to taste and 2 cups grated cheese.
To prepare this casserole, begin by cooking the squash. Cut the top of the squash off, then slice the squash in half lengthwise. Remove the seeds, and cut the squash into small slices. Place the slices in a deep skillet, cover with water, and boil until the squash is tender. Drain the water, and transfer the squash to a greased casserole dish. Pour the mushroom soup over the squash, and top the casserole with thyme. Bake the casserole for 45 minutes at 350 degrees Fahrenheit. Top with cheese, and heat until melted.
A more traditional recipe for squash casserole combines 2 cups chopped squash, 1 cup grated cheese, 2 beaten eggs, 1/2 cup milk, 1/4 cup melted butter, 1 medium chopped onion, 14 crushed Ritz crackers and salt and pepper as desired. To make this casserole, cut the squash and onion into small slices, and transfer them to a deep skillet. Cover with water, and boil until tender. Drain the water, and add milk, eggs, butter, cheese and half the crushed Ritz crackers. Pour mixture into a greased casserole dish, top with the remaining crushed crackers, and bake for 20 to 30 minutes at 400 degrees Fahrenheit.