01 - Preheat the oven to 400°F. Line a large baking sheet with parchment paper.
02 - Heat a large skillet over medium heat. Add the spinach and cook for 2–3 minutes until wilted. Drain any excess liquid and allow to cool completely.
03 - In a mixing bowl, combine the cooled spinach, crumbled feta, cream cheese, minced garlic, chopped dill, parsley, black pepper, nutmeg, and lemon zest. Mix thoroughly until all ingredients are evenly distributed.
04 - Lay one sheet of phyllo pastry on a clean work surface. Keep the remaining sheets covered with a damp towel to prevent drying. Lightly brush the entire surface with melted butter.
05 - Cut the buttered sheet lengthwise into 2 equal strips. Place 1 heaping tablespoon of filling at the bottom edge of each strip. Fold the corner over the filling to create a triangle shape. Continue folding in a triangular pattern until you reach the end of the strip. Repeat with all remaining pastry sheets and filling.
06 - Arrange the filled crisps on the prepared baking sheet. Brush the tops generously with additional melted butter. Sprinkle with sesame seeds if desired.
07 - Bake for 18–20 minutes until the crisps are golden brown and crispy. Serve warm or allow to cool to room temperature before serving.