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Combine butter and oil in skillet and heat until butter is melted. Working with 1 sheet of filo at a time (keep remaining sheets covered to prevent drying out), sprinkle sheet with portion of cheese in middle, then gather up ends like a hobo's packet to enclose cheese. Set packet in lightly greased 12x13" pan. Brush with butter mixture. Continue with remaining sheets and cheese, fitting packets snugly together in baking dish, brushing each packet with butter mixture. (Can be prepared ahead to this point. Cover and refrigerate.) When ready to bake, beat together eggs, yogurt and baking soda in bowl. Pour over filled packets. Bake at 400 10 minutes. Reduce heat to 350 and bake 20-30 minutes longer or until golden. Cool slightly. Cut into squares to serve. |