Preheat oven to 400˚. Spray a large rimmed baking sheet with cooking spray.
Place one sheet of phyllo dough in an even layer on prepared pan. Brush with melted butter, and sprinkle with 2 tablespoons cheese and approximately ⅛ teaspoon pepper. Repeat procedure 11 times with remaining phyllo, melted butter, cheese, and pepper. Cut stacked phyllo into 2-inch squares or diamonds.
Bake until golden brown, about 12 minutes. Let cool for at least 10 minutes before serving.
Recipe by Victoria at https://victoriamag.com/spanakopita-salad-recipe/