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Preheat your oven to 375°F (190°C).
For the casserole, combine the cooked chicken, broccoli, and cheese in a baking dish. Top with breadcrumbs.
In a saucepan, melt butter and whisk in the flour. Slowly add milk and stir until it thickens.
Pour the sauce over the chicken mixture, stir to combine, and bake for 45 minutes, or until golden brown.
For the soufflé, separate egg whites and yolks. Beat the egg whites until stiff peaks form.
Mix the egg yolks with flour and milk, then gently fold in the beaten egg whites.
Pour the mixture into a greased ramekin and bake for 25-30 minutes at 375°F (190°C), or until puffed and golden.