Preheat the oven to 350 degrees. Grease a 9x13-inch pan with nonstick cooking spray.
In a pot on the stove, the microwave or a vegetable steamer, cook the broccoli until crisp-tender. Arrange the broccoli on the bottom of the prepared pan.
Layer the chicken over the broccoli.
In a mixing bowl combine the soup, lemon juice, mayonnaise, and curry powder. Pour the sauce over the chicken.
Top with the grated cheese.
In a small bowl, combine the bread crumbs and butter. Mix well and sprinkle over the top of the casserole. Bake for 30-35 minutes or until the sauce is bubbly, the cheese is melted, and the crumb topping is toasted.
Note: If freezing, allow the casserole to cool slightly. Wrap, label, and chill in the refrigerator before freezing. To bake, thaw completely before baking.