Preheat oven to 350 degrees. Spray rectangle baking dish with nonstick spray. Melt butter and add onions to a saucepan, cook until translucent. Add kale in batches and cook until wilted. Sift flour over kale mixture. Cook 2-3 minutes then add half and half, 1 cup parmesan, and cream cheese. In another bowl combine 1 cup parmesan, panko, and spices. Sprinkle over kale in baking dish and cook 35 minutes until brown and bubbly.