Crumble the feta with a for or your hands, then mix it with cream cheese, grated parmesan, eggs and Greek yogurt until creamy and combined.
Preheat the oven to 350℉ and Brush a 9x13-inch baking pan with melted butter.
Layer 2 sheets of phyllo dough in the dish, brush with butter, and repeat with 4 more sheets, buttering every second sheet.
Take a phyllo sheet and place half of it in the pan, let the rest hang from the side. do the same with 5 more sheets, allowing half of each sheet to hang outside the pan (you'll fold these over later).
Spread the cheese filling evenly over the phyllo and gently fold the hanging phyllo sheets over the filling.
Finish by topping with 8 additional phyllo sheets, brushing every 2 sheets with melted butter.
Brush the top layer with melted butter or olive oil and sprinkle with sesame seeds if desired.
Bake at 350°F for approximately 1 hour, until golden brown.
Let the tiropita cool and set for at least 30 minutes before slicing and serving.