What you need:

1 sheet puff pastry 
1 to 2 cups mushrooms
1 tbsp butter
¼ cup chopped onions
½ tsp all spice
½ tsp Italian spices
Salt to taste
Black pepper to taste

How to:

1. Preheat the oven to 375 degrees
2. Fry all the ingredients till the mushrooms are browned and have shrunk and allow to cool
3. Cut the rolled out puff pastry into equal pieces/squares and spoon the mushroom mixture unto the squares
4. Close the puff pastry squares like little parcels
5. Bake until golden brown (15 to 20 minutes)
6. Serve warm

ENJOY!