These Spanakopita pastries are perfect as a party appetizer, or you can make them larger for a main course item. It's a great way to use up fresh spinach!To make this recipe even quicker, use frozen thawed spinach and mix it directly with the cheeses for the filling.
Heat a large pan on medium. Melt the olive oil and butter. Once it starts sizzling, add the onions and garlic. Once they are softened, add the rinsed spinach leaves and cook down.
Drain the spinach mixture in a colander.
Add the spinach mixture, followed by the pine nuts (if using), and cheeses, to a food processor. Blend until smooth.
Roll out each sheet of puff pastry on lightly floured surface. Cut each sheet into 6 squares.
Beat the egg in a small bowl.
Place a small amount of filling in the middle of each square and fold over into a triangle. Seal edges with a fork. Brush the top of each pastry with beaten egg.
Bake on cookie sheet at 375 F for 20-25 minutes or until golden brown. Serve immediately.