Baked Zucchini Casserole

This is another recipe I found on Kill the Gluten and adapted a little to make it a main course. We love zucchini and this was a great variation!

Ingredients:
- 4 1/2 cups sliced zucchini (I used 6 cups and thought it was perfect!)
- 2 to 3 T. olive oil
- salt and pepper (I used some garlic salt too)
- 1 medium onion, chopped
- 2 c. spaghetti sauce
- 1 1/2 cups mozzarella cheese, shredded
- 6 eggs
- 1 cup Parmesan cheese
**I added 1/2 lb. ground beef while cooking the onions**

Directions:
In a large skillet, heat the olive oil. Add zucchini and saute. Season with salt and pepper. Transfer to a 9x13 pan.
In the same skillet, add onion (and beef) and saute until soft. Add spaghetti sauce and heat thoroughly. Pour over the zucchini. Sprinkle the mozzarella cheese over the top of the sauce.
Mix eggs and Parmesan cheese. Pour over the mozzarella cheese. Bake at 375 for 25 minutes. Let it stand for 15 minutes before serving.