01 - Preheat the oven to 400°F. Line a large baking sheet with parchment paper.
02 - In a large skillet over medium heat, wilt the spinach for 2–3 minutes. Drain any excess liquid and let cool.
03 - In a bowl, combine the cooled spinach, feta, cream cheese, garlic, dill, parsley, black pepper, nutmeg, and lemon zest. Mix until well combined.
04 - Place one sheet of phyllo pastry on a clean surface; keep remaining sheets covered with a damp towel to prevent drying. Lightly brush the sheet with melted butter.
05 - Cut the sheet lengthwise into 2 equal strips. Place 1 heaped tablespoon of filling at the bottom of each strip. Fold the corner over the filling to form a triangle; continue folding up the strip, maintaining the triangle shape, until you reach the end. Repeat with remaining pastry and filling.
06 - Arrange the crisps on the prepared baking sheet. Brush the tops with more melted butter and sprinkle with sesame seeds if desired. Bake for 18–20 minutes, or until the crisps are golden brown and crisp. Serve warm or at room temperature.