1. Preheat the oven to 400 degrees F. Coat an 8-inch square baking dish with nonstick cooking spray.
2. Melt the butter in a medium skillet over medium heat. Add the onion and saute for 2 to 3 minutes, or until tender. Remove from the heat and add the flour; mix well. Add the hot water and stir until well blended.
3. In a large bowl, combine the cheese spread, eggs, and chopped broccoli. Add the onion mixture; mix well. Pour into the baking dish and sprinkle with the bread crumbs.
4. Bake for 25 to 30 minutes, or until heated through. Cut and serve.