There are so many different ways to prepare a squash casserole. I made this one up as I went along yesterday. I think it was the best one I've made in a long while!
6 medium squash, ends trimmed
1 T. olive oil
1/2 medium yellow onion, chopped
salt and pepper to taste
1 egg, lightly beaten
1/2 - 3/4 cup sour cream
1 cup sharp cheddar cheese, divided
Preheat oven to 350 degrees and lightly grease a small to medium casserole dish.
Grate squash on a box grater using the large hole side.
Add olive oil to medium skillet and heat over medium high heat. Add squash, onions and salt and pepper and let cook, stirring frequently until moisture evaporates from squash, 3 - 5 minutes. Remove from heat and allow to cool for about 5 minutes.
Place squash and onions into a medium bowl and add the egg and sour cream. Fold in 1/2 cup of the shredded cheese.
Spoon into casserole dish and top with remaining 1/2 cup of cheese. Bake for 20 - 25 minutes until golden brown.