In a bowl mix both cheeses
Grease the bottom of a round aluminum baking pan (1 1/2 " deep).
Start layering the filo leaves About 2 at the time, sprinkling each one with melted butter. After each 3-4 layers, sprinkle the cheese mixture, ending up with a flat layer of filo on top.
With sharp knife, cut the banitza in diamonds.
Heat the remaining butter and pore on top and into the cuts.
In bowl, mix the whisked eggs with the 7-up.
Pore on top of the banitza. Shake it to allow the liquid to get into the cuts.
Let stand for 5 min.
Bake in a preheated 350* oven on the middle rack for about 1 hr. or until golden brown