To prepare a spooky calzone snake recipe, first you need to prepare the dough. You can use any kind of dough you like, but I like to use pistachio dough because it's so moist and delicious. Preheat the oven to 375 degrees F (190 degrees C). Lightly grease the bottom and sides of the tin with non-stick cooking spray. Place the flour, baking powder, sugar, and salt into the mixing bowl. Add the butter and mix until the mixture is light and fluffy. Pour in the milk and beat the egg whites until stiff peaks form. Slowly add the dry ingredients to the wet ingredients. Mix until they are just combined. Bake for 20 minutes or until browned. Remove from oven and allow to cool for 5 minutes before serving.