In a bowl, mix the grated cheese with the milk until very well combined. Set aside.
Separate the egg whites from the yolks and add them to another bowl. Beat with a mixer until soft peaks form. Now add the yolks, one by one, and continue beating after each addition. Set aside.
Sift the flour and the baking powder together into a third bowl. Add the sugar and stir. Now add the egg white and yolk mixture to the flour and mix well until all the flour is incorporated.
Add the sour cream, melted butter, and the cheese and milk mixture. Mix well until smooth.
Preheat an oven to 375°F (190°C). Butter and lightly flour a 9x13 inch baking dish. Pour the batter spreading it evenly. Sprinkle with the sesame seeds.
Bake for 35-40 minutes or until a toothpick inserted into the center comes out clean. Allow to cool before removing from the baking dish. Cut into slices and enjoy!