Onion Casserole

Here is another recipe from Esther Lee Martin, my father's sister. This sounds really good. It doesn't say how long to cook.

350 degree oven

4 cups sliced onions (cut 1/3 in thick) preferably Vidalia
5 T butter
Salt and pepper
2 eggs
1 cup light cream
2/3 cup freshly grated Parmesan cheese

1. Butter a 1 qt. casserole
2. Add sliced onions to the casserole and dot with butter
3. Generously add salt and pepper
4. Mix the eggs and cream and pour over the onions
5. Top with parmesan cheese