European Kitchen - "Cheese and Mushroom Casserole"

Mushroom Casserole with Cheeses**

- 1 kg sliced mushrooms- 1/4 cup olive oil- 1 cup chopped onions- 1 1/2 cups cream cheese- 1/2 cup yogurt- 1 cup Parmesan cheese- 1 cup mozzarella cheese- 1 teaspoon dried garlic- 1/4 cup chopped parsley- 1 tablespoon thyme- Salt and pepper