Place a large dutch oven coated with cooking spray over medium heat until hot. add onion; saute 3 minutes. add spinach; cover and cook 2 minutes or until spinach wilts. add cream cheese oregano, salt and pepper. uncover and cook an additional minute or until cream cheese melts. Spoon spinach mixture into a 1 quart gratin dish or shallow casserole coated with cooking spray. Arrange tomato slices in a single layer on top of spinach and sprinkle with breadcrumbs and parmesan cheese.
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