Preheat oven to 350°F (180°C).

Dissolve yeast in warm water.

Scald milk and add to sugar, butter, and salt; stir until butter is melted.

Mix cinnamon and flour in a separate bowl.

Add half of the flour mixture to the milk mixture and mix until smooth.

Beat 3 eggs and add them to the mixture along with the dissolved yeast.

Gradually add the remaining flour, mixing until a soft dough forms.

Turn the dough out onto a floured surface.

Knead the dough until it is smooth and satiny.

Shape the dough into a ball and place it in a buttered bowl.

Cover the bowl and let the dough rise in a warm place until it has doubled in size (approximately 2 1/2 to 3 hours).

Punch down the risen dough and divide it in half.

Place each half into a greased 8-inch round pan.

Let the dough rise again in a warm place until it has doubled in size (approximately 1 1/2 to 2 hours).

Brush the tops of the dough with the remaining beaten egg.

Bake in the preheated oven for 20 to 30 minutes, or until golden brown.

Cool on wire racks before slicing and serving.