appetizer recipe

12 large white mushrooms 2 tablespoons olive oil 1/4 cup finely chopped onion 2 cloves garlic, minced 1/4 cup grated Parmesan cheese 1/4 cup breadcrumbs 2 tablespoons chopped fresh parsley 1/2 teaspoon dried thyme Salt and freshly ground black pepper, to taste 4 oz cream cheese, softened