Spinach Roll Ups

PERFECT appetizer for a party. Everyone enjoyed them at our New Year's Eve party.

1 sheet puff pastry
1 box spinach, thawed and drained
2 cups cheese
1 egg beaten with 1 Tbsp water

Brush thawed pastry with egg. Layer with spinach and cheese. Roll up and cut into 20 small pieces. Brush with left over egg mixture. Bake at 400 degrees for about 20 minutes. Serve warm.