Preheat your oven to 375°F (190°C).
Unroll the phyllo pastry sheets and cover them with a damp cloth to prevent drying out.
Brush a baking dish with melted butter or olive oil to prevent sticking.
Layering:
Place one sheet of phyllo pastry in the baking dish, allowing the edges to hang over the sides. Brush the sheet with melted butter or olive oil.
Repeat the process, layering about 6-8 sheets of phyllo, brushing each sheet with butter or oil.
Add the Filling:
Spread half of the spinach and cheese filling evenly over the phyllo layers.
Continue Layering:
Add another 6-8 layers of phyllo pastry, brushing each layer with butter or oil.
Add the Remaining Filling:
Spread the remaining filling over the phyllo layers.
Top Layer and Finish: