Brush a large sheet tray with butter and put one sheet of phyllo dough on it, brush it with butter, add a second sheet and brush it with butter. Sprinkle a third of the walnut mixture over the phyllo and repeat the steps layering two sheets of phyllo with butter and then sprinkling on the walnut mixture. It doesn’t matter that much on how many sheets you have or where you sprinkle the walnut sugar, just layer things somewhat evenly and top the stack with phyllo and butter, not walnuts.
Bake at 375F for 15-20 minutes or until the top and all the edges are golden brown.
Let cool and crumble into pieces, serve with Greek yoghurt and honey.