In a medium bowl, mix together the honey, chopped walnuts, ground cinnamon, and vanilla extract until well combined. Set aside.
Take one sheet of phyllo pastry and brush it lightly with melted butter. Place another layer on top and brush again with butter, repeating this with a total of 5 layers.
Spoon half of the honey and walnut mixture evenly over the layered pastry.
Repeat the layering process with another 5 sheets of phyllo pastry, each brushed with melted butter, on top of the filling.
Spread the remaining honey and walnut mixture on top of the second phyllo layer and then fold the edges over to secure the filling. Brush the top layer with melted butter.
Use a sharp knife to cut shallow slits in the top layer of pastry to create diamond shapes for easy serving.
Bake in the preheated oven for 30-35 minutes, or until the top is golden brown.
Remove from the oven and let it cool for about 10-15 minutes.
To serve, dust the pie with powdered sugar, cut along the slits, and garnish with fresh mint leaves. Serve with a dollop of Greek yogurt on the side if desired.
Notes
Serve with a dollop of Greek yogurt for added creaminess.