Cinnamon - banana rolls with whole wheat flour

Unfortunately not all of it is made of whole wheat flour, because I'm always afraid that the dough is gonna be too thick if I only use whole wheat (although the yeast made it quite airy). At the beginning I wanted to put the banana in the dough but it would have been too soft, so the banana became the stuffing. Maybe it's better like this, the taste is stronger. 

Ingredients

• 20 dkg of whole wheat flour
• 25 dkg of Graham flour
• 20 dkg of plain flour
• 10 dkg of sugar
• 4 dl of milk
• 10 dkg of butter
• 1 egg
• 1 packet of instant yeast
• a pinch of salt 
• 3 bananas 
• 2 tbl spoons of ground cinnamon 
• 1 egg for the wash

Put the milk, the butter and the sugar in a pan and start cooking it on a very low fire. You don't need to boil it, just make the sugar and the butter melt in the milk. Meanwhile measure the flour and mix it with the salt and the yeast. I usually make the dough in a bread baking machine. When the milk is ready stir a beaten egg into it. Pour the mixture into the machine with the flour and start making the dough. 

While the machine is doing its job, smash the bananas with a fork and mix it with the cinnamon. Strech the dough quite big and slush the stuffing on it. Start rolling it up starting from the longer side. When it's done, start cutting it in 2 cm wide slices. Put the pieces on an oven pan and give them an egg wash. Cook them in the oven at 200 deg Celsius for 15 minutes. Let it cool and then you can eat it.