Zucchini Casserole

From: Aunt Jonne Bolger

4 medium zucchini, diced (about 4 cups)
2 medium onions, chopped (frozen, fresh or dried)
3 large eggs
1/2 C vegetable oil
1/2 C grated cheddar cheese
1 C bisquick
1 t salt
1 t pepper
1 t oregano

Mix everything except eggs and oil in a greased 2 qt casserole dish. Beat eggs, add oil, then pour over zucchini mixture. Bake at 350 degrees for 40 minutes uncovered.
Note: this can be overcooked, undercooked, or reheated and it is still delicious.