French croutons

Cut bread and apple into circles 0. 5 cm thick. Spread mugs of bread with butter on one side, put on a baking sheet with this side. Grate the brynza, mix with yolks and flour. Spread the upper side of the laid pieces of bread with this mixture, put on top of a mug of apple, put whipped whites on the apple (you can coat the apple with a mixture of brynza). Bake in the oven until brown.