#### **Step 1: Prepare the Filling**
Heat olive oil in a large skillet over medium heat.
Add onion and cook until soft, about 3 minutes. Add garlic and cook for another minute.
Stir in spinach, salt, black pepper, and nutmeg, cooking until wilted (or warmed through if using frozen spinach).
Remove from heat and let cool slightly. Stir in parsley, eggs, feta, and ricotta until combined.
#### **Step 2: Assemble the Spanakopita**
Preheat oven to 375°F (190°C). Grease a 9x13-inch baking dish.
Layer 8 sheets of phyllo dough in the dish, brushing each layer with melted butter or olive oil.
Spread the spinach-feta filling evenly over the phyllo.
Layer the remaining 8 sheets of phyllo on top, brushing each with butter.
Score the top with a sharp knife into squares or triangles.
#### **Step 3: Bake & Serve**
Bake for **40-45 minutes**, or until golden brown and crisp.
Let cool for 10 minutes before slicing.
Serve warm or at room temperature.