Butter a baking dish and sprinkle with sugar. Preheat the oven to 180 ° C. Cut the toast into small pieces and pour milk over them.
Separate the eggs. Mix the warm butter with icing sugar until creamy, gradually mix in the egg yolks. Squeeze out the toast and stir in.
Mix the poppy seeds, crumbs and flour. Beat the egg white with sugar to a creamy snow and stir into the butter and egg yolk mixture, fold in the poppy seed mixture.
Pour the mixture into the mold and spread it evenly. Bake the casserole in the preheated oven (middle shelf) for about 20 minutes.