Onion cakes

In my German cooking class we recently made a local favorite for late fall. The literal translation of the name of the dish is onion cake, it is not a cake. It has a crust and then is onions and egg baked on top, then topped with cheese. I made it the other night for Nathan and he loved it.
1. Slice 5-6 onions, saute with either butter or oil.
2. In a sauce pan head 1/2 cup milk and 1/3 cup butter to 100-120 degrees Fahrenheit. Add one packet of yeast to the milk. Then add this mixture to the milk mixture to 1 1/4 cups flour in a large bowl. Add 1 tsp salt. Let flour mixture set for 15 minutes in a warm area.
3. Add 1 - 1.5 cups of diced ham or bacon, I did a mix the other day, to the onions. Continue to saute until onions are very soft but not yet turning brown.
4. Heat oven to 350 degrees Fahrenheit. Line pan with wax paper, I use my German cookie sheet which is the size of a small US cookie sheet but it is about 1 1/2" deep. You need a pan that is at least 1" deep.
5. Roll dough out into bottom of cookie sheet.
6. In a large bowl add 8 ounces of sour cream and 4 eggs to onion mixture. Add 1.5 cups of mozzarella cheese to onion mix. Pour this onto the dough.
7. Top with 2.5 cups mozzarella cheese. Bake for 40-50 minutes or until egg is completely firm.

I have pictures of what I made the other night but the site is not letting me upload pictures at this time, I will try later.

 Guten Apetit!