1 (1 ounce) square unsalted butter pastry
3 eggs, beaten
1 cup all-purpose flour
1/3 cup warm milk
1 1/2 cups chopped spinach
3 cups shredded Cheddar cheese
Preheat oven to 350 degrees F (175 degrees C). Spread half the butter pastry onto the bottom of a 9x13 inch baking dish. Place one sheet of pastry on an ungreased cookie sheet and lightly dust with the egg mixture. Sprinkle with green cheese. Place eggs on top of pie. Cover the top sheet with the remaining butter and place entire baking dish on inverted baking sheet. Press lightly on top sheet to maintain crisp appearance.
Bake in preheated oven for 35 minutes, or until golden brown.