01 - Preheat the oven to 375°F. Line a baking tray with parchment paper and set aside.
02 - In a mixing bowl, combine the chopped artichoke hearts, sliced green onions, grated Graviera cheese, Greek yogurt, dill, parsley, lemon zest, black pepper, and salt. Stir until evenly incorporated.
03 - Lay one filo sheet flat on a clean work surface. Cover the remaining sheets with a damp towel to keep them pliable. Lightly brush the sheet with melted butter. Place a second sheet on top and brush again with butter. Repeat until three sheets are stacked and each layer is buttered.
04 - Using a sharp knife, cut the layered filo stack lengthwise into three equal strips.
05 - Place approximately 1 tablespoon of filling near the bottom of each strip. Fold one corner over the filling to create a triangle. Continue folding the strip upward, keeping the triangular shape consistent, until the entire strip is used.
06 - Position each filled triangle seam side down on the prepared baking tray. Repeat the layering, cutting, and folding process with the remaining filo sheets and filling to yield 12 puffs total.
07 - Brush the tops of the assembled puffs with melted butter or an egg wash for a deeper golden color during baking.
08 - Bake for 20 to 25 minutes until the pastry is golden brown and crisp on the edges.
09 - Allow the puffs to cool slightly on the tray before serving. They are best enjoyed warm.